Translation:

74. When fear had passed from (the mind of) Abraham and the glad tidings had reached him he began to plead with Us for Lut's people.

Notes (Tafseer)

1571. Glad-tidings: not only that he was to have a son, but that he was to be a fountain-head of prophets. So he now begins to plead at once for the sinful people to whom Lot was sent as a warner.