"Clothe them from the clothes you yourself wear." Al-Adab Al-Mufrad 188
Arabic hadith text
حَدَّثَنَا سَعِيدُ بْنُ سُلَيْمَانَ، قَالَ: حَدَّثَنَا مَرْوَانُ بْنُ مُعَاوِيَةَ، قَالَ: حَدَّثَنَا الْفَضْلُ بْنُ مُبَشِّرٍ قَالَ: سَمِعْتُ جَابِرَ بْنَ عَبْدِ اللهِ يَقُولُ: كَانَ النَّبِيُّ صلى الله عليه وسلم يُوصِي بِالْمَمْلُوكِينَ خَيْرًا وَيَقُولُ: أَطْعِمُوهُمْ مِمَّا تَأْكُلُونَ، وَأَلْبِسُوهُمْ مِنْ لَبُوسِكُمْ، وَلاَ تُعَذِّبُوا خَلْقَ اللهِ عَزَّ وَجَلَّ.
Translation
Jabir ibn 'Abdullah said, "The Prophet, may Allah bless him and grant him peace, advised that slaves should be well-treated. He said, 'Feed them from what you eat and clothe them from what you wear. Do not punish what Allah has created.'"