Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) wrote to al-Mundhir bin Sawa: Whoever offers our prayer, faces our qiblah and eats our slaughtered animals, that is the Muslim; he has the protection of Allah and of His Messenger (peace and blessings be upon him).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10253