Hadith 2036
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)
أَخْبَرَنَا إِسْحَاقُ بْنُ مَنْصُورٍ، قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ، عَنْ سُفْيَانَ، عَنْ أَبِي إِسْحَاقَ، عَنْ أَبِي الْخَلِيلِ، عَنْ عَلِيٍّ، قَالَ : سَمِعْتُ رَجُلاً، يَسْتَغْفِرُ لأَبَوَيْهِ وَهُمَا مُشْرِكَانِ فَقُلْتُ : أَتَسْتَغْفِرُ لَهُمَا وَهُمَا مُشْرِكَانِ فَقَالَ أَوَلَمْ يَسْتَغْفِرْ إِبْرَاهِيمُ لأَبِيهِ . فَأَتَيْتُ النَّبِيَّ صلى الله عليه وسلم فَذَكَرْتُ ذَلِكَ لَهُ فَنَزَلَتْ <A id="q3" name="q3" href="javascript:openquran(8,114,114)"><c_q3>{ وَمَا كَانَ اسْتِغْفَارُ إِبْرَاهِيمَ لأَبِيهِ إِلاَّ عَنْ مَوْعِدَةٍ وَعَدَهَا إِيَّاهُ }</c_q3></a> .