Sayyiduna Abdullah (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) wrote to al-Mundhir bin Sawa: "Whoever prays as we pray, faces our qiblah, and eats our slaughtered animals, that is the Muslim; he has the protection (dhimmah) of Allah and of His Messenger (peace and blessings be upon him)."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17964