The Ruling on the Sacrifice of One Who Abandons Prayer

Question :

If a person who has abandoned prayer slaughtered an animal, would it be permissible for one who prays to eat from that slaughtered animal?

Answer:

Prayer ris the greatest of the five pillars (of Islam) after the two Shahadahs and whoever abandons it rejecting its obligationis a disbeliever, according to the consensus of the Muslims. Whoever abandoned it out of neglect or laziness, the most correct statement from among the sayings of the scholars is that he is guilty of disbelief. The basis for this is in the narration of Muslim in his Sahih, from the Prophet, in which he said:
"Between the worshipper and disbelief and polytheism is abandoning prayer."

And, the narration of Imam Ahmad in his Musnad and the compilers of the Sunan, with an authentic chain of narrators, from the Prophet, in which it is reported that he said:
"The covenant between us and them is the prayer, therefore, whoever abandons it has committed an act of disbelief.

Based upon this, if the person about whom you ask has abandoned the prayer and rejected its obligation, his sacrifice may not be eaten, according to the consensus of the scholars. If he abandoned it due to negligence or laziness, then according to the view of those who hold that he has disbelieved and that is the more obvious it is not permissible to eat what he has slaughtered by his hand, because he is an apostate and the sacrifice of the apostate may not be eaten, as the scholars have made clear-may Allah have mercy on them.

And Allah is the Granter of success. May peace and blessings be upon our Prophet, Muhammad and upon his family and Companions.

Source:
The Permanent Committee
Fatawa Islamiyah, Vol. 6 Pages 270-271