Messenger of Allah ﷺ said, "Whoever prays like us and faces our Qibla and eats our slaughtered animals is a Muslim and is under Allah's and His Apostle's protection. So do not betray Allah by betraying those who are in His protection."

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ صَلَّى صَلاَتَنَا وَاسْتَقْبَلَ قِبْلَتَنَا وَأَكَلَ ذَبِيحَتَنَا فَذَلِكَ الْمُسْلِمُ الَّذِي لَهُ ذِمَّةُ اللَّهِ وَذِمَّةُ رَسُولِهِ فَلاَ تُخْفِرُوا اللَّهَ فِي ذِمَّتِهِ

Messenger of Allah ﷺ said, "I have been ordered to fight the people till they say: 'None has the right to be worshipped but Allah.' And if they say so, pray like our prayers, face our Qibla and slaughter as we slaughter, then their blood and property will be sacred to us and we will not interfere with them except legally and their reckoning will be with Allah."

قَالَ رَسُولُ اللَّهِ ﷺ أُمِرْتُ أَنْ أُقَاتِلَ النَّاسَ حَتَّى يَقُولُوا لاَ إِلَهَ إِلاَّ اللَّهُ فَإِذَا قَالُوهَا وَصَلَّوْا صَلاَتَنَا وَاسْتَقْبَلُوا قِبْلَتَنَا وَذَبَحُوا ذَبِيحَتَنَا فَقَدْ حَرُمَتْ عَلَيْنَا دِمَاؤُهُمْ وَأَمْوَالُهُمْ إِلاَّ بِحَقِّهَا وَحِسَابُهُمْ عَلَى اللَّهِ

Narrated Maimun bin Siyah that he asked Anas bin Malik, "O Abu Hamza! What makes the life and property of a person sacred?" He replied, "Whoever says, 'None has the right to be worshipped but Allah', faces our Qibla during the prayers, prays like us and eats our slaughtered animal, then he is a Muslim, and has got the same rights and obligations as other Muslims have."

عَنِ النَّبِيِّ ﷺ وَقَالَ عَلِيُّ بْنُ عَبْدِ اللَّهِ حَدَّثَنَا خَالِدُ بْنُ الْحَارِثِ قَالَ حَدَّثَنَا حُمَيْدٌ قَالَ سَأَلَ مَيْمُونُ بْنُ سِيَاهٍ أَنَسَ بْنَ مَالِكٍ قَالَ يَا أَبَا حَمْزَةَ مَا يُحَرِّمُ دَمَ الْعَبْدِ وَمَالَهُ فَقَالَ مَنْ شَهِدَ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ وَاسْتَقْبَلَ قِبْلَتَنَا وَصَلَّى صَلاَتَنَا وَأَكَلَ ذَبِيحَتَنَا فَهُوَ الْمُسْلِمُ لَهُ مَا لِلْمُسْلِمِ وَعَلَيْهِ مَا عَلَى الْمُسْلِمِ