Kulaib b. Manfa'ah said that his grandfather told then he went to the Prophet ﷺ and said:

Messenger of Allah! to whom should I show kindness? He said: Your mother, your sister, your brother and the slave whom you set free and who is your relative, a due binding (on you), and a tie of relationship which should be joined.

حَدَّثَنَا مُحَمَّدُ بْنُ عِيسَى، حَدَّثَنَا الْحَارِثُ بْنُ مُرَّةَ، حَدَّثَنَا كُلَيْبُ بْنُ مَنْفَعَةَ، عَنْ جَدِّهِ، أَنَّهُ أَتَى النَّبِيَّ ﷺ فَقَالَ يَا رَسُولَ اللَّهِ مَنْ أَبَرُّ قَالَ
" أُمَّكَ وَأَبَاكَ وَأُخْتَكَ وَأَخَاكَ وَمَوْلاَكَ الَّذِي يَلِي ذَاكَ حَقٌّ وَاجِبٌ وَرَحِمٌ مَوْصُولَةٌ " .