Ibn 'Abbas said, "If any Muslim obeys Allah regarding his parents, Allah will open two gates of the Garden for him. If there is only one parent, then one gate will be opened. If one of them is angry, then Allah will not be pleased with him until that parent is pleased with him." He was asked, "Even if they wrong him?" "Even if they wrong him" he replied.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا حَجَّاجٌ، قَالَ: حَدَّثَنَا حَمَّادٌ هُوَ ابْنُ سَلَمَةَ، عَنْ سُلَيْمَانَ التَّيْمِيِّ، عَنْ سَعِيدٍ الْقَيْسِيِّ، عَنِ ابْنِ عَبَّاسٍ قَالَ: مَا مِنْ مُسْلِمٍ لَهُ وَالِدَانِ مُسْلِمَانِ يُصْبِحُ إِلَيْهِمَا مُحْتَسِبًا، إِلاَّ فَتْحَ لَهُ اللَّهُ بَابَيْنِ يَعْنِي: مِنَ الْجَنَّةِ وَإِنْ كَانَ وَاحِدًا فَوَاحِدٌ، وَإِنْ أَغْضَبَ أَحَدَهُمَا لَمْ يَرْضَ اللَّهُ عَنْهُ حَتَّى يَرْضَى عَنْهُ، قِيلَ: وَإِنْ ظَلَمَاهُ؟ قَالَ: وَإِنْ ظَلَمَاهُ.
sunnah.com