Should he sell tapes by daa’iyahs whose ways sometimes differ from the Sunnah?
Question

                What is the ruling on opening an Islamic bookstore to sell books, Islamic tapes and Mus-hafs, if I sell tapes by some shaykhs who make mistakes in many of their words and deeds, such as not wearing a beard and telling the masses not to let their beards grow?

 What is the ruling on selling such tapes, knowing that they have helped many to become committed Muslims?.
Praise be to Allah.One of the good 
    characteristics of Ahl al-Sunnah wa’l-Jamaa’ah is that they know the right 
    path and show compassion towards people, so they love to speak with 
    knowledge and fairness, and they hate wrongdoing and ignorance, because they 
    follow the Book of Allaah whenever He commands them to treat people with 
    fairness and to judge them on the basis of knowledge and truth.  
Allaah says (interpretation 
    of the meaning): 
“O you who believe! Stand 
    out firmly for justice, as witnesses to Allaah, even though it be against 
    yourselves, or your parents, or your kin”
[al-Nisa’ 4:135] 
“…and that when you judge 
    between men, you judge with justice”
[al-Nisa’ 4:58] 
“And whenever you give 
    your word (i.e. judge between men or give evidence), say the truth”
[al-An’aam 6:152]
The human soul can only 
    reach this level when it works for the sake of Allaah free from any ego or 
    worldly interests, and when it is aware that Allaah can see into the depths 
    of the conscience and what is hidden in the heart. According to the hadeeth: 
    “Those who are fair and just will be on thrones of light.” Narrated by 
    Muslim, 2827. 
One of the du’aa’s of the 
    Prophet  (peace and blessings of Allaah be upon him) was: “I ask You to 
    (make me speak) the word of truth at times of anger and at times of 
    contentment.” Narrated by al-Nasaa’i, 1305; classed as saheeh by al-Albaani 
    in Saheeh al-Nasaa’i.
 If you think about the 
    divinely-ordained method by means of which Allaah raised people to the 
    pinnacle of self-control, tolerance and speaking the word of truth even if 
    it goes against one’s self, one’s parents or one’s relatives, you will 
    understand that many of the daa’iyahs who are involved in the field of 
    contemporary Islamic da’wah, who have some good qualities and a great deal 
    of influences among the masses, are doing well in the aspects in which they 
    excel, and in the aspects in which they are falling short they are either 
    striving to reach the right conclusion by means of their own ijtihaad, in 
    which case they will receive either one reward or two, or they are falling 
    short in some aspects but we hope, in sha Allaah, that their good deeds will 
    make up for their bad deeds, especially in the case of those who have 
    influenced the people and led to them becoming righteous. Depriving the 
    people of access to their call, when there is no effective alternative, is a 
    method that is not approved of in Islam, for one of the basic principles of 
    sharee’ah is to reduce evils and promote good among the people. 
The good that is achieved by 
    these daa’iyahs, such as guiding the youth, encouraging girls to observe 
    hijab and encouraging people to pray regularly are important matters that 
    are among the greatest aims of sharee’ah. 
The shortcomings that you 
    mention, meaning that some daa’iyahs fall short in some aspects, should not 
    be allowed to overshadow the benefits mentioned, especially since they have 
    to do with minor issues and are limited to the individual, whereas the 
    benefits are great and reach many people. 
Hence there is no reason why 
    you should not sell tapes by these daa’iyahs, so long as they are following 
    the way of Ahl al-Sunnah wa’l-Jamaa’ah. If any of them make a mistake with 
    regard to some matter, the way of Ahl al-Sunnah wa’l-Jamaa’ah is to advise 
    them by getting in touch with them or writing to them. 
Whoever thinks about the 
    daa’iyahs who deliver khutbahs and lectures or broadcast on TV and radio 
    etc, will notice that they are of different types: 
Some of them are following 
    the path of the salaf in their methodology, moderation and action.  We 
    should listen to these daa’iyahs and encourage people to listen to them. 
Some of them are correct in 
    most of what they say, but they fall somewhat short in the field of action. 
    They should be listened to, because their shortcomings are usually limited 
    only to themselves. 
Some of them mix right and 
    wrong but in general they follow the Sunnah and do not adopt any ideas of 
    bid’ah (innovation) and do not promote it, so we should not put people off 
    from listening to them altogether, rather we should correct their mistakes 
    and speak about their errors in a just and fair manner, whilst also praising 
    their good points. 
Some of them are people of 
    bid’ah and shirk, which they spread and promote. We should not listen to 
    them and we should warn others against them, and not praise their good 
    points, because that means we are praising them when they have committed 
    major sins which cancel out any good deeds. 
The above has to do with the 
    daa’iyahs. 
On the other hand, there are 
    people who speak of the daa’iyahs in a just manner, and others who speak of 
    them in an unfair manner. 
Among the latter there are 
    some who are unjust and unfair; they accuse some daa’iyahs of bid’ah when in 
    fact they do not follow bid’ah, and warn others against them, when it is 
    more appropriate to warn people against these unfair critics, because they 
    are unfair and wrongdoers. No attention should be paid to their warnings 
    because of their unfairness and wrongdoing. 
Hence we must know how to 
    distinguish between sin, bid’ah, error and mistakes with regard to the basic 
    tenets of ‘aqeedah. 
We will give some examples: 
If there is a daa’iyah who 
    calls people to the path of the salaf, but he is extreme and harsh, then he 
    should be praised for his methodology but he should be given advice with 
    regard to his harshness. 
If there is a preacher who 
    quotes da’eef and munkar (weak and unsound) ahaadeeth, but there is also a 
    lot of truth in what he says, then he should be praised for his preaching, 
    but he should be told of the error of his quoting weak and fabricated 
    ahaadeeth and taking them as evidence. 
If there is someone who 
    reminds the people and teaches them about proper morals, etiquette and 
    virtues, but he shaves his beard, for example, or sits in mixed gatherings, 
    then he should be praised for his good qualities but should be told of the 
    rulings regarding the matters where he goes against the Sunnah. If he calls 
    for abandoning some of the obligatory or mustahabb Sunnahs, then that view 
    should also be refuted. 
If there is someone who 
    teaches the people bid’ah (innovations) and encourages them to associate 
    others with Allaah, such as seeking the help of the Prophet  (peace and 
    blessings of Allaah be upon him), dead “saints” (awliya’) or occupants of 
    graves, or encourages them to pray to them and ask of them, then we should 
    warn others against him and explain the falseness of his belief and shirk. 
    We should tell the people not to listen to anything that he says because it 
    involves dangerous and harmful ideas. 
If there is someone who 
    mixes truth and falsehood, Sunnah and bid’ah, we should not encourage the 
    people to listen to him; rather we should point out the error of his ways. 
    When he starts to propagate his wrong ideas, then the should be advised and 
    requested to retract these ideas publicly. If he does not do that, then his 
    mistakes should be announced in the same gathering where he promoted his 
    mistaken ideas. 
And Allaah is the Source of 
    strength.