Repentance
[9:114]
And Abraham’s prayer that his father be forgiven was but due to a promise which he had given the latter [in his lifetime]; but when it was made clear unto him that he had been God’s enemy, [Abraham] disavowed him – [although,] behold, Abraham was most tender-hearted, most clement.

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* v.114 : Abraham’s promise to his father is mentioned in 19:47-48 and 60:4; for the actual prayer, see 26:86-87.