«من صلى صلاتنا واستقبل قبلتنا وأكل ذبيحتنا فذاكم المسلم الذي له ذمة الله وذمة رسوله فلا تخفروا الله في ذمته»
The Prophet (peace and blessings be upon him) said:
"Whoever prays our prayer, faces our qiblah and eats what we slaughter, that is the Muslim who has the protection of Allah and the protection of His Messenger. So do not betray Allah with regard to anyone under His protection."
Hadith Referenceصحیح الجامع الصغیر / حرف الميم / 6350