Hisham bin Urwah narrates from his father that Sayyiduna Zubair (may Allah be pleased with him) stated that this verse was revealed about us: "And blood relatives are heirs of one another (this is the command in Allah's Book)." The Prophet (peace and blessings be upon him) made two Muhajir and one Ansari brothers to each other, so we had no doubt that we would inherit from one another, meaning if Sayyiduna Ka'b (may Allah be pleased with him) passed away and had no heir, I thought that I would become his heir, and if I died, then likewise he would become my heir, until this verse was revealed.