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It was narrated that Anas bin Malik (ra) said: “When the Prophet (peace be upon him) died, there was a man in Al-Madinah who used to make a niche in the grave and another who used to dig graves without a niche. They said: ‘Let us pray Istikharah to our Lord and call for them both, and whichever of them comes first, we will let him do it.’ So they were both sent for, and the one who used to make the niche-grave came first, so they made a niche-grave for the Prophet (peace be upon him).”

(Sunan Ibn Majah 1557, Book 6, Hadith 125)