A: It is Halal (lawful) for Muslims to eat from them, according to Ijma` (consensus of scholars), unless it is known that they are not slaughtered according to Shari`ah (Islamic law), such as by strangling and the like, because Allah (Glorified be He) says:
Made lawful to you this day are AtTayyibât [all kinds of Halâl (lawful) foods, which Allâh has made lawful (meat of slaughtered eatable animals, milk products, fats, vegetables and fruits)]. The food (slaughtered cattle, eatable animals) of the people of the Scripture (Jews and Christians) is lawful to you and yours is lawful to them. (Surah AlMa'idah).
In his explanation of this Ayah (Qur'anic verse), AlHafizh ibn Kathir (may Allah be merciful with him) said:
"When Allah (Exalted be He) mentioned the evil things which He has rendered as Haram (prohibited) for His believing Servants and the good things which He has rendered as Halal for them, He said: Made lawful to you this day are AtTayyibât [all kinds of Halâl (lawful) foods Allah then mentioned the ruling on eating the slaughtered animals of the People of the Book, namely, the Jews and the Christians, by saying: The food (slaughtered cattle, eatable animals) of the people of the Scripture (Jews and Christians) is lawful to you Ibn `Abbas, Abu Umamah, Mujahid, Sa`id ibn Gubayr, `Ikrimah, `Ata', AlHasan, Makhul, Ibrahim AlNakh`y, AlSuddiy, and Muqatil ibn Hayyan said: The food refers to their slaughtered animals; and the Muslim scholars have agreed that it is Halal for Muslims to eat from their slaughtered animals.