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On the authority of Ibn Masood (may Allah be pleased with him) who said:

The Messenger of Allah ﷺ said, “It is not permissible to spill the blood of a Muslim except in three [instances]: the married person who commits adultery, a life for a life, and the one who forsakes his religion and separates from the community.”

[Al-Bukhari]
[Muslim]
عَنْ ابْنِ مَسْعُودٍ رَضِيَ اللهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صلى الله عليه و سلم "لَا يَحِلُّ دَمُ امْرِئٍ مُسْلِمٍ [ يشهد أن لا إله إلا الله، وأني رسول الله] إلَّا بِإِحْدَى ثَلَاثٍ: الثَّيِّبُ الزَّانِي، وَالنَّفْسُ بِالنَّفْسِ، وَالتَّارِكُ لِدِينِهِ الْمُفَارِقُ لِلْجَمَاعَةِ". [رَوَاهُ الْبُخَارِيُّ]
، [وَمُسْلِمٌ]

Classification

Sahih (Authentic)

References

• 40 Hadith Nawawi, Hadith 14