(And unto each We have appointed heirs and near kindred …) [4:33].
Abu ‘Abd Allah Muhammad ibn ‘Abd Allah al-Farisi informed us> Muhammad ibn ‘Abd Allah ibn Hamawayh al-Harawi> ‘Ali ibn Muhammad al-Khuza‘i> Abu’l-Yaman al-Hakam ibn Nafi‘> Shu‘ayb ibn Abi Hamzah> al-Zuhri> Sa‘id ibn al-Musayyab who said: “The verse (And unto each We have appointed heirs) was revealed about those who used to adopt men who were not their natural sons and then make them inherit from them. Allah, exalted is He, revealed about them that something should be apportioned for them in the bequest while the division of estate He specifically allocated for the heirs who were immediate family relatives or close relatives. He denied a share of the estate to those who were adopted and, instead, allowed them to have a portion of the bequest”.
Asbab Al-Nuzul by Al-Wahidi , trans. Mokrane Guezzou