The Book of Bequests (Kitab Al-Wasiyya)
Muslim :: Book 13 : Hadith 3994
Mus'ab b. Sa'd reported on the authority of his father. I was ailing. I sent message to Allah's Apostle (may peace be upon him) saying: Permit me to give away my property as I like. He refused. I (again) said: (Permit me) to give away half. He (again refused). I (again said): Then one-third. He (the Holy Prophet) observed silence after (I had asked permission to give away) one-third. He (the narrater) said: It was then that endowment of one-third became permissible.
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