He vowed to offer an ‘aqeeqah for his son, but he was unable to fulfil his vow; what must he do?
Question

                He vowed to offer an ‘aqeeqah if Allaah blessed him with a son, but when he was blessed with a son, he did not have any money, so he could not afford the price of the animal. What should he do?.
Praise be to Allah.
    Firstly: 

    It is proven that the Prophet  (peace and blessings of 
    Allaah be upon him) forbade making vows, and he said that they are a means 
    of getting something out of the miser. This prohibition is confirmed in the 
    case of one who believes that he may get what he wants because of the vow, 
    or that Allaah may give him what he wants because of his vow. 

    It says in al-Mawsoo’ah al-Fiqhiyyah (40/140), 
    discussing the ruling on vows: 

    Al-Qurtubi said: It seems to me that making a vow is haraam 
    in the case of the one who thinks that the vow is a means to achieving some 
    end or that Allaah will give him what he wants because of the vow, so making 
    the vow – in this case – is haraam, and it is makrooh in the case of one who 
    does not believe that. End quote. 

    How often we receive messages from people who made vows to do 
    acts of worship, then they were not able to do them. What the Muslim should 
    do is to guard his tongue and not make vows. The one who wants to give 
    charity, fast or offer a sacrifice should do that without making a vow, so 
    that he will not be putting himself under pressure: if he wants to refrain 
    from that he may do so and there will be no blame on him, instead of 
    exposing himself to the risk of not fulfilling the vow, which is a serious 
    matter. 

    See also the answer to question no. 
    42178. 

    Secondly: 

    ‘Aqeeqah is a confirmed Sunnah, which should not be omitted 
    by the one who is able to do it. This has been discussed in the answer to 
    question no. 12448. 

    If a person makes a vow to offer an ‘aqeeqah on behalf of his 
    son, then he must do that, because the Prophet  (peace and blessings of 
    Allaah be upon him) said: “Whoever vows to obey Allaah, let him obey Him.” 
    Narrated by al-Bukhaari (6696). 

    If he is unable to fulfil this vow, then one of two scenarios 
    must apply: 

    1-

    either he stipulated a specific time for slaughtering the 
    ‘aqeeqah, whether he spoke that out loud or intended it, such as one who 
    intends to slaughter it in the first week or the first month after the 
    birth. If that specific time has passed and he was unable to fulfil his vow, 
    then he must offer expiation for breaking an oath (kafaarat yameen), because 
    the Prophet  (peace and blessings of Allaah be upon him) said: “The 
    expiation for breaking a vow is kafaarat yameen.” Narrated by Muslim (1645). 

    2-

    or he did not stipulate a specific time for slaughtering the 
    ‘aqeeqah, so the ‘aqeeqah remains as a debt which he owes, until he is able 
    to fulfil his vow, because there is no specific time for the ‘aqeeqah which 
    he has missed, rather it is valid to slaughter it at any time, even if it is 
    years after the birth. 

    And Allaah knows best.