Mahabharata Adi Parva Chapter 100:6

Mahabharata Adi Parva Chapter 100:6 "Vaisampayana continued, 'Upon these words of the son of Ganga, the hair on the fisherman's body stood on end from glee, and he replied, 'I bestow my daughter!' Immediately after, the Apsaras and the gods with diverse tribes of Rishis began to rain down flowers from the firmament upon the head of Devavrata and exclaimed, 'This one is Bhishma (the terrible).' Bhishma then, to serve his father, addressed the illustrious damsel and said, 'O mother, ascend this chariot, and let us go unto our house.' "Vaisampayana continued, 'Having said this, Bhishma helped the beautiful maiden into his chariot. On arriving with her at Hastinapura, he told Santanu everything as it had happened. And the assembled kings, jointly and individually, applauded his extraordinary act and said, 'He is really Bhishma (the terrible)!' And Santanu also, hearing of the extraordinary achievements of his son, became highly gratified and bestowed upon the high-souled prince the boon of death at will, saying, 'Death shall never come to thee as long as thou desirest to live. Truly death shall approach thee, O sinless one, having first obtained thy command.'"