"How wonderful it is for one of them that he obeys Allah and fulfills the rights of his master." Meaning the slave. And Ka'b said: "Allah and His Messenger spoke the truth."
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ نِعِمَّا لأَحَدِهِمْ أَنْ يُطِيعَ رَبَّهُ وَيُؤَدِّيَ حَقَّ سَيِّدِهِ يَعْنِي الْمَمْلُوكَ وَقَالَ كَعْبٌ صَدَقَ اللَّهُ وَرَسُولُهُ وَفِي الْبَابِ عَنْ أَبِي مُوسَى وَابْنِ عُمَرَ