Al-Ahzab 33:6

Annabiyyu awla bilmu/mineenamin anfusihim waazwajuhu ommahatuhum waoloo al-arhamibaAAduhum awla bibaAAdin fee kitabiAllahi mina almu/mineena walmuhajireena illaan tafAAaloo ila awliya-ikum maAAroofan kanathalika fee alkitabi mastoora

The Prophet is more worthy of the believers than themselves, and his wives are [in the position of] their mothers. And those of [blood] relationship are more entitled [to inheritance] in the decree of Allāh than the [other] believers and the emigrants, except that you may do to your close associates a kindness [through bequest]. That was in the Book inscribed.

The Prophet is closer to the believers than their own selves, and his wives are their mothers; and those having mutual kinship are closer to one another (for the purpose of inheritance) than (other) believers and emigrants according to the Book of Allah, unless you do some good to your friends (by making a will in their favor). This had been written in the Book (the Preserved Tablet).