The meaning of the additional

1. My father, may Allah grant him mercy, said: We were told by Ahmad bin Idrees, from Muhammed bin Ahmad bin Isa bin Muhammed, from Ali bin Mahziyar, from Ahmad bin Muhammed al-Bazanti, from Yahya bin Imran, from Abu Abdillah, peace be upon him, with regards to the saying of Allah, Exalted and Glorious is He: «And We granted to him Ishaq, and Ya’qoub as an addition.» (21:72) He said