Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings be upon him) said: "It is not permissible to shed the blood of any Muslim person who testifies that there is no deity except Allah and that I am the Messenger of Allah, except in one of three cases: a person who becomes a disbeliever after accepting Islam, a person who commits adultery despite being married, or a life for a life."
Hadith Referenceمسند الحميدي / 119
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«إسناده صحيح ، وأخرجه البخاري 6878، ومسلم: 1676، وابن حبان فى ”صحيحه“ برقم: 4407، 4408، 5976، 5977، وأبو يعلى الموصلي فى ”مسنده“:4767، 5202»