Sahih Muslim 2552 c
Abdullah b. Dinar reported that when 'Abdullah b. 'Umar set out to Mecea, 'he kept a donkey with him which he used as a diversion from the tedium of journey on the camel's back and had a turban which he tied round his head. One day, as he was riding the donkey a desert Arab happened to pass by him. He ('Abdullah b. 'Umar) said:
Arn't you so and so? He said: Yes He gave him his donkey and said: Ride it, and tie the turban round your head. Some of his companions said: May Allah pardon you, you gave to this desert Arab the donkey on which you enjoyed ride for diversion and the turban which you tied round your. head. Thereupon he said: Verily I heard Allah's Messenger (ﷺ) as saying: The finest act of goodness is the kind treatment of a person to the loved ones of his father after his death and the father of this person was a friend of 'Umar.
حَدَّثَنَا حَسَنُ بْنُ عَلِيٍّ الْحُلْوَانِيُّ، حَدَّثَنَا يَعْقُوبُ بْنُ إِبْرَاهِيمَ بْنِ سَعْدٍ، حَدَّثَنَا أَبِي،
 وَاللَّيْثُ بْنُ سَعْدٍ جَمِيعًا عَنْ يَزِيدَ بْنِ عَبْدِ اللَّهِ بْنِ أُسَامَةَ بْنِ الْهَادِ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ،
 عَنِ ابْنِ عُمَرَ، أَنَّهُ كَانَ إِذَا خَرَجَ إِلَى مَكَّةَ كَانَ لَهُ حِمَارٌ يَتَرَوَّحُ عَلَيْهِ إِذَا مَلَّ رُكُوبَ الرَّاحِلَةِ
 وَعِمَامَةٌ يَشُدُّ بِهَا رَأْسَهُ فَبَيْنَا هُوَ يَوْمًا عَلَى ذَلِكَ الْحِمَارِ إِذْ مَرَّ بِهِ أَعْرَابِيٌّ فَقَالَ أَلَسْتَ
 ابْنَ فُلاَنِ بْنِ فُلاَنٍ قَالَ بَلَى ‏.‏ فَأَعْطَاهُ الْحِمَارَ وَقَالَ ارْكَبْ هَذَا وَالْعِمَامَةَ - قَالَ - اشْدُدْ
 بِهَا رَأْسَكَ ‏.‏ فَقَالَ لَهُ بَعْضُ أَصْحَابِهِ غَفَرَ اللَّهُ لَكَ أَعْطَيْتَ هَذَا الأَعْرَابِيَّ حِمَارًا كُنْتَ تَرَوَّحُ
 عَلَيْهِ وَعِمَامَةً كُنْتَ تَشُدُّ بِهَا رَأْسَكَ ‏.‏ فَقَالَ إِنِّي سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم
 يَقُولُ ‏
"‏ إِنَّ مِنْ أَبَرِّ الْبِرِّ صِلَةَ الرَّجُلِ أَهْلَ وُدِّ أَبِيهِ بَعْدَ أَنْ يُوَلِّيَ ‏"‏ ‏.‏ وَإِنَّ أَبَاهُ كَانَ صَدِيقًا
 لِعُمَرَ ‏.‏