He wants to call other employees to pray but he is hesitant
Question

                I offer namaz regularly (mash-allah) also when i am in office, but in my office i have other muslim brothers who dont offer namaz. I want to talk to them but feel that if i try to convince them i will stop offering namaz. I dont understand why i have these feeling. Please guide me. Also in my office i asked our tea boy why he does not offer namaz. He said he has to clean toilet daily so he gets impure to offer namaz and evening when he reaches home he is tired as he is working for 12 hours so he is not able to offer. Please tell me how do i convince this person. I also always pray for him so that he starts offering namaz regularly.
Praise be to Allah.
    We ask Allaah to increase you in faith and piety and to help 
    you to adhere to that which He has enjoined. 

    You should not hesitate to advise your colleagues and remind 
    them about the prayer, rather that is what Allaah has enjoined. Allaah says 
    (interpretation of the meaning): 

    “Let there arise out 
    of you a group of people inviting to all that is good (Islam), enjoining 
    Al-Ma‘roof (i.e. Islamic Monotheism and all that Islam orders one to do) and 
    forbidding Al-Munkar (polytheism and disbelief and all that Islam has 
    forbidden). And it is they who are the successful”

    [Aal ‘Imraan 3:104]

    “O my son! 
    Aqim-is-Salaah (perform As-Salaah), enjoin (on people) Al-Ma‘roof  (Islamic 
    Monotheism and all that is good), and forbid (people) from Al-Munkar (i.e. 
    disbelief in the Oneness of Allaah, polytheism of all kinds and all that is 
    evil and bad), and bear with patience whatever befalls you. Verily, these 
    are some of the important commandments (ordered by Allaah with no 
    exemption)”

    [Luqmaan 31:17]

    And the Prophet  (peace and blessings of Allaah be upon 
    him) said: “Whoever among you sees an evil action, let him change it with 
    his hand (by taking action); if he cannot, then with his tongue (by speaking 
    out); if he cannot then with his heart (by hating it and feeling that it is 
    wrong), and that is the weakest of faith.” Narrated by Muslim, 49. 

    Not praying is a great evil, indeed it is kufr that puts one 
    beyond the pale of Islam, according to the more correct of the two scholarly 
    opinions, because the Prophet  (peace and blessings of Allaah be upon 
    him) said: “Between a man and kufr and shirk there stands his giving up 
    prayer.” Narrated by Muslim, 82. 

    And he  (peace and blessings of Allaah be upon him) said: 
    “The covenant that stands between us and them is prayer, whoever gives it up 
    is a kaafir.” Narrated by al-Tirmidhi, 2621; al-Nasaa’i, 463; Ibn Maajah, 
    1079. 

    You should not even entertain the notion of not praying, 
    rather you should hate that thought as you would hate to be thrown into the 
    fire, as the Prophet  (peace and blessings of Allaah be upon him) said: 
    “There are three things, whoever attains them has found the sweetness of 
    faith: when Allaah and His Messenger are dearer to him than anything else; 
    when he loves a person and only loves him for the sake of Allaah; and when 
    he would hate to go back to kufr as he would hate to be thrown into the 
    fire.” Narrated by al-Bukhaari, 49; Muslim, 60. 

    With regard to the excuse that your colleague gives about his 
    clothes becoming impure, the answer is that he can clean the bathrooms 
    without his clothes becoming impure, and he can also set aside pure clothes 
    for praying in.  You should note that one who truly respects the prayer and 
    understands its importance and the seriousness of not praying would not give 
    such an excuse. 

    It is essential to advise this man and others, and explain 
    the ruling concerning one who does not pray, and the obligation to offer 
    prayer on time, and that it is haraam to delay it until after work or before 
    going to bed, because Allaah says (interpretation of the meaning): 

    “Then, there has succeeded them a posterity who have given 
    up As-Salaah (the prayers) [i.e. made their Salaah (prayers) to be lost, 
    either by not offering them or by not offering them perfectly or by not 
    offering them in their proper fixed times] and have followed lusts. So they 
    will be thrown in Hell”

    [Maryam 19:59]
Ibn Mas’ood said concerning al-ghayy 
    (translated above as “Hell”): This is a valley in Hell which is very deep 
    and has a foul taste. 

    And Allaah says (interpretation of the meaning): 

    “So woe unto those performers of Salaah (prayers) 
    (hypocrites),

    5. Those who delay their Salaah (prayer from their stated 
    fixed times)”

    [al-Maa’oon 107:4-5]
Delaying prayer until its time is over is a 
    major sin, and not praying at all is major kufr – we seek refuge with Allaah 
    from that. 

    And Allaah knows best. 

    See also question no. 
    47425.