Is it permissible to move books that have been donated to one mosque as a waqf to another mosque?
Question

                Is it permissible to move books from one mosque to another? How? Who has the right to do that? Are there any conditions?.
Praise be to Allah.
    Firstly: 
The basic principle is 
    that things that have been donated as a waqf to a specific mosque should not 
    be moved elsewhere, because the one who donated them gave them to that 
    specific mosque, so it is not permissible to move them elsewhere. 

    Secondly: 

    Some of the scholars stated that it is permissible – and this 
    is the correct view – to move them to another mosque so long as moving them 
    is more beneficial than leaving them where they are, such as if there are 
    more people who will benefit from them in the second mosque than in the 
    first; or if there is a number of daa’iyahs and seekers of knowledge who 
    will benefit from them and benefit others. 

    Shaykh al-Islam Ibn Taymiyah (may Allaah have mercy on him) 
    said: 

    It is permissible to change the conditions stipulated by the 
    waqf donor to something that is more beneficial, even if that varies with 
    time, such as if a person set up a waqf for the fuqaha’, but then the people 
    need jihad, in which case it may be given to the troops. End quote. 

    Al-Ikhtiyaaraat, p. 176 
Shaykh Ibn ‘Uthaymeen 
    (may Allaah have mercy on him) said about changing some conditions 
    stipulated by the donor to something that is better: 

    This is an issue concerning which the scholars differed. Some 
    of them said that if the donor stipulated conditions in the waqf, but the 
    person in charge thinks that something else is better for the people and 
    will bring a greater reward, then there is nothing wrong with him changing 
    it. Some of them disallowed that and said that this man gave this wealth in 
    a certain manner so it is not permissible to dispose of it except in the 
    manner that he stipulated. 

    Those who say that it is permissible say that the idea behind 
    waqf is kindness so whatever is kinder is more beneficial to the one who 
    donated the waqf. They quoted as evidence the fact that a man came to the 
    Prophet  (peace and blessings of Allaah be upon him) during the year of 
    the conquest (of Makkah) and said: “O Messenger of Allaah, I vowed that if 
    Allaah enabled you to conquer Makkah, I would pray in Bayt al-Maqdis 
    (Jerusalem).” He said: “Pray here.” He repeated what he had said, and (the 
    Prophet  (peace and blessings of Allaah be upon him)) said: “Pray here.” 
    He repeated it and he said: “Pray here.” He repeated it and he said, “It is 
    up to you then.” 

    A waqf is like a vow, so if the Prophet  (peace and 
    blessings of Allaah be upon him) permitted the one who had made a vow to 
    change it to that which was better, then the same applies to one who has 
    donated a waqf. This is the correct view, that it is permissible to change 
    the conditions stipulated by the waqf donor to that which is better, so long 
    as the waqf is not donated for the benefit of a specific person. If the waqf 
    is donated for a specific person then it is not permissible to change it to 
    something that is better, because it is specific and the right belongs to a 
    specific person, so it cannot be changed. End quote from al-Sharh 
    al-Mumti’, 9/560, 561 

    Thirdly: 
With regard to who has 
    the right to do that, it is the one who is in charge of the waqf, who has 
    been appointed by the one who donated these books as a waqf. If there is no 
    such person, then reference should be made to the body that is responsible 
    for these books, such as the ministry of awqaaf in a Muslim country.

     And Allaah knows best.