´Maimun bin Siyah asked Anas bin Malik:` "O Abu Hamzah, what makes the blood and wealth of a Muslim forbidden?" He said: "Whoever bears witness to La ilaha illallah (there is none worthy of worship except Allah) and that Muhammad is the Messenger of Allah [SAW], faces our Qiblah, prays as we pray, and eats our slaughtered animals, he is a Muslim, and has the same rights and obligations as the Muslims."
Hadith Referenceسنن نسائي / كتاب تحريم الدم / 3973
Among the signs of a person's being a Muslim is also this: that he eats the slaughtered meat (dhabihah) of Muslims, because the People of the Book and other non-Muslims dislike eating the slaughtered meat of Muslims.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 3973