Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) was asked about the slaughtered animals of the Christians of the Arabs, and he said: There is no harm in it, and he recited this verse: "And whoever among you befriends them is indeed one of them." [Surah al-Ma'idah: 51]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18802