Collecting the skins of the sacrificial animals, selling them and giving the price in charity
Question

                The mosque committees here in Algeria collect the skins of the sacrificial animals and sell them to leather manufacturing companies, and they spend the money thus earned on building mosques, and they argue that many people nowadays do not need them and they throw them away. Is this action permissible? Is it permissible for a person to give the skin of the sacrificial animal to them if they come to his house and he knows beforehand that they are going to sell it?.
Praise be to Allah.Firstly: 
It is not permissible for 
    the one who offers the sacrifice to sell the skin of his sacrificial animal, 
    because it has been singled out for Allaah in all its parts, and that which 
    has been singled out for Allaah is not permissible for anyone to make money 
    from it. Hence the butcher should not be given any of it by way of payment. 
Al-Bukhaari (1717) and 
    Muslim (1317) narrated that ‘Ali (may Allaah be pleased with him) said: The 
    Messenger of Allaah  (peace and blessings of Allaah be upon him) 
    commanded me to take care of his sacrificial animals, and to give their 
    meat, skins and blankets in charity, and not to give the butcher any of it. 
    He said: “We will pay him ourselves.” 
It says in Zaad 
    al-Mustaqni’: Its skin should not be sold, or any other part of it, 
    rather it should be made use of. 
Shaykh Ibn ‘Uthaymeen (may 
    Allaah have mercy on him) said in his Sharh (7/514): “Its skin should 
    not be sold” after slaughter, because it has been singled out for Allaah in 
    all its parts, and that which has been singled out for Allaah is not 
    permissible for anyone to make money from it. The evidence for that is the 
    hadeeth of ‘Umar ibn al-Khattaab which says that he provided someone with a 
    horse to ride in jihad for the sake of Allaah, but the man to whom he gave 
    it neglected the horse and did not take care of it. ‘Umar came and asked the 
    Prophet  (peace and blessings of Allaah be upon him) for permission to 
    buy it because he thought that its owner would sell it cheaply, but the 
    Prophet  (peace and blessings of Allaah be upon him) said to him: “Do 
    not buy it even if he gives it to you for a dirham.” The reason for that is 
    that it was given for the sake of Allaah, and whatever a person gives for 
    the sake of Allaah, it is not permissible for him to take it back. Hence it 
    not permissible for the one who has migrated from a land of shirk to go back 
    and live there, because he left a land that he loves for the sake of Allaah, 
    so it is not permissible  for him to go back to something that he loves if 
    he gave it up for the sake of Allaah. And because the skin is part of the 
    animal like the meat, i.e., it is not permissible to sell it, just as it is 
    not permissible to sell its meat. 
“or any other part of it” 
    means that none of its parts may be sold, such as the liver, leg, head, 
    stomach and so on. The reason is the same as that mentioned above. End 
    quote. 
Hence it is known that what 
    is prescribed is to make use of the skin or to give it in charity to one who 
    deserves it, such as a poor or needy person. But if the one who offers the 
    sacrifice gives the skin in charity to a poor person, and the poor person 
    sells it, there is no sin on either of them. 
Shaykh Muhammad al-Mukhtaar 
    al-Shanqeeti (may Allaah preserve him) said: If there is a company that will 
    buy the skins in the same abattoir, and he gives it to a poor person, and 
    the poor person goes and sells it to this company, there is nothing wrong 
    with that. End quote from Sharh Zaad al-Mustaqni’. 
Secondly: 
With regard to selling the 
    skins and giving their price in charity, the scholars differed concerning 
    that. Some of them said that it is permissible and this is the view of the 
    Hanafis and was mentioned in one report from Imam Ahmad (may Allaah have 
    mercy on him), but the majority did not permit it. 
It says in Tabyeen 
    al-Haqaa’iq (6/9): If he sells it for a few dirhams to give them in 
    charity, it is permissible, because it is an act of worship like giving the 
    skin and meat in charity. 
Ibn al-Qayyim (may Allaah 
    have mercy on him) said in Tuhfat al-Mawdood bi Ahkaam al-Mawlood p. 
    89: Abu ‘Abd-Allaah ibn Hamdaan said in al-Ri’aayah: It is 
    permissible to sell its skin and offal and head, and give the price in 
    charity. This was stated by Imam Ahmad. 
Al-Khallaal said: ‘Abd 
    al-Malik ibn ‘Abd al-Hameed told me that Abu ‘Abd-Allaah (i.e., Imam Ahmad) 
    said: Ibn ‘Umar sold the skin of a cow and gave its price in charity. 
Ishaaq ibn Mansoor said: I 
    said to Abu ‘Abd-Allaah: What should be done with the skin of the 
    sacrificial animals? He said: It should be made use of and its price given 
    in charity. I said: Can it be sold and its price given in charity? He said: 
    Yes, (because of) the hadeeth of Ibn ‘Umar. End quote. 
See also al-Insaaf 
    (4/93). 
Al-Shawkaani (may Allaah 
    have mercy on him) said in Nayl al-Awtaar (5/153): They were 
    unanimously agreed that its meat may not be sold, and the same applies to 
    the skin. But al-Awzaa’i, Ahmad, Ishaaq and Abu Thawr regarded it as 
    permissible, and this is also the view of the Shaafa’is who said: It should 
    be disposed of as the udhiyah itself is disposed of. End quote. 
Based on this, there is 
    nothing wrong with giving the skins to the charitable organizations who will 
    sell them and give their price in charity. This is a charitable project, 
    because most people do not make use of the skins of the sacrificial animals, 
    so selling the skins and giving the price in charity is achieving the 
    intended purpose, which is to benefit the poor and avoid the haraam thing, 
    which is offering compensation to the one who offered the sacrifice for any 
    part of his udhiyah. 
It should noted that the 
    udhiyah may be given to the rich as a gift, so if the one who offers the 
    sacrifice intends that he is giving the skin as a gift to the charitable 
    organization which is collecting them, there is nothing wrong with that. 
    Then the charity may sell them and give the price in charity however it wishes. 
And Allaah knows best.