Translation:

72. And We bestowed on him Isaac and as an additional gift (a grandson) Jacob and We made righteous men of every one (of them).

Notes (Tafseer)

2728. Nafilat has many meanings: (1) booty; (2) extra work or prayer; (3) extra or additional gift; (4) grandson. The two last significations are implied here. Not only was Abraham given a son in his old age; he was given not only Isaac, but several sons, the chief being Isma'il and Isaac, who both joined in burying him (Gen. xxv. 9); and he also saw grandsons. Isma'il is specially mentioned later (xxi. 85) apart from Isaac's line, on account of his special importance for Islam.