(102) باب النَّهْىِ عَنْ الاِسْتِغْفَارِ، لِلْمُشْرِكِينَ
It was narrated that 'Ali said:
"I heard a man praying for forgiveness for his parents who were idolaters, and I said: 'Are you praying for forgiveness for them even though they are idolators?" He said: 'Didn't Ibrahim pray for forgiveness for his father?' I went to the Prophet and told him about that, then the following revealed: And Ibrahim's (Abraham) invoking (of Allah) for his father's forgiveness was only because of a promise he (Ibrahim) had made to him (his father)." (Daif)
Reference: Sunan an-Nasa'i 2036
In-book reference: Book 21, Hadith 220
English translation: Vol. 3, Book 21, Hadith 2038