Sahih Muslim 2552 a
Ibn Dinar reported that a desert Arab met Abdullah b. 'Umar on the way to Mecca. 'Abdullah greeted him and mounted him upon the donkey on which he had been riding and gave him the turban that he had on his head. Ibn Dinar (further) reported:
We said to him ('Abdullah b. 'Umar): May Allah do good to you, these are desert Arabs and they are satisfied even with meagre (things). Thereupon Abdullah said: His father was loved dearly by 'Umar b. Khattib and I heard Allah's Messenger (ﷺ) as saying: The finest act of goodness on the part of a son is to treat kindly the loved ones of his father.
حَدَّثَنِي أَبُو الطَّاهِرِ، أَحْمَدُ بْنُ عَمْرِو بْنِ سَرْحٍ أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، أَخْبَرَنِي 
 سَعِيدُ بْنُ أَبِي أَيُّوبَ، عَنِ الْوَلِيدِ بْنِ أَبِي الْوَلِيدِ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ،
 أَنَّ رَجُلاً، مِنَ الأَعْرَابِ لَقِيَهُ بِطَرِيقِ مَكَّةَ فَسَلَّمَ عَلَيْهِ عَبْدُ اللَّهِ وَحَمَلَهُ عَلَى حِمَارٍ كَانَ يَرْكَبُهُ
 وَأَعْطَاهُ عِمَامَةً كَانَتْ عَلَى رَأْسِهِ فَقَالَ ابْنُ دِينَارٍ فَقُلْنَا لَهُ أَصْلَحَكَ اللَّهُ إِنَّهُمُ الأَعْرَابُ وَإِنَّهُمْ
 يَرْضَوْنَ بِالْيَسِيرِ ‏.‏ فَقَالَ عَبْدُ اللَّهِ إِنَّ أَبَا هَذَا كَانَ وُدًّا لِعُمَرَ بْنِ الْخَطَّابِ وَإِنِّي سَمِعْتُ رَسُولَ
 اللَّهِ صلى الله عليه وسلم يَقُولُ ‏
"‏ إِنَّ أَبَرَّ الْبِرِّ صِلَةُ الْوَلَدِ أَهْلَ وُدِّ أَبِيهِ ‏"‏ ‏.‏