Even if someone vowed to do this, he would not be permitted to fulfil his vow. If the founder of an endowment stipulated it, that stipulation would be invalid. Likewise, the scholars disapproved of giving charity at a grave, and an endowment founder’s stipulation requiring this would be invalid. Still more objectionable is placing food and drink on a grave for people to take, for this and similar practices belong to the unbelievers among the Turks, not to the Muslims.
He—may Allah have mercy on him—also said:
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It is permissible to offer a pregnant animal as an Eid sacrifice. If its young comes out dead, the mother’s lawful slaughter suffices for it as well, according to al-Shāfiʿī, Ahmad, and others, whether or not it has developed hair. If it comes out alive, it must be slaughtered. Mālik’s position is that if it has developed hair, it is lawful to eat; otherwise, it is not. According to Abū Hanīfah, it is not lawful to eat unless it is lawfully slaughtered after coming out. And Allah knows best.