It is narrated from Sayyiduna Abbas bin Abd al-Muttalib (may Allah be pleased with him) that he said: The Messenger of Allah (peace and blessings be upon him) said: "The Prophet of Allah Dawud (peace be upon him) said: 'O my Lord, I hear people saying: the Lord of Ishaq.' So Allah Almighty said: 'Indeed, Ishaq gave his own life generously (in sacrifice) for Me.'" This hadith is sahih (authentic); people have narrated it from Ali bin Zayd bin Jud'an, and he is alone in narrating it.

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he said: "Sayyidah Sarah (peace be upon her) was ninety years old and Sayyiduna Ibrahim (peace be upon him) was one hundred and twenty years old. So when the fear left Ibrahim, and the glad tidings of Ishaq (peace be upon him) came to him, and he felt safe from those (angels) whom he had feared, he said: 'All praise is for Allah, who has granted me in old age Isma'il and Ishaq. Indeed, my Lord is the Hearer of supplication.' [Surah Ibrahim: 39] Then Jibril (peace be upon him) came to Sarah (peace be upon her) with the glad tidings and said: 'Receive the glad tidings of a child named Ishaq, and after Ishaq, of Ya'qub.' Ibn Abbas (may Allah be pleased with them both) said: So she struck her forehead in astonishment, and that is the saying of Allah Almighty: 'And she struck her face' [Surah al-Dhariyat: 29] , and she said: 'Shall I give birth while I am an old woman and this husband of mine is an old man? Indeed, this is an amazing thing.' They said: 'Are you amazed at the decree of Allah? The mercy of Allah and His blessings be upon you, O people of the house. Indeed, He is Praiseworthy, Glorious.' [Surah Hud: 72-73] ." Imam Bukhari used Ikrimah as evidence and Imam Muslim used al-Suddi as evidence, and the chain of this hadith is sahih (authentic), but they did not record it.