Ibn Umar reported: The Messenger of Allah, peace and blessings be upon him, said, “A believer continues to have room for error in his religion as long as he does not shed sacred blood.”
Source: Ṣaḥīḥ al-Bukhārī 6469
Grade: Sahih (authentic) according to Al-Bukhari
عَنْ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَنْ يَزَالَ الْمُؤْمِنُ فِي فُسْحَةٍ مِنْ دِينِهِ مَا لَمْ يُصِبْ دَمًا حَرَامًا
6469 صحيح البخاري كتاب الديات باب قول الله تعالى ومن يقتل مؤمنا متعمدا فجزاؤه جهنم