Sahih Muslim 1508
Sahih Muslim · Book 20: The Book of Emancipating Slaves · The prohibition of a manumitted slave taking anyone as a Mawla except the one who manumitted him
Abu Huraira (Allah be pleased with him) reported Allah's Apostle (ﷺ) as saying:
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، حَدَّثَنَا حُسَيْنُ بْنُ عَلِيٍّ الْجُعْفِيُّ ، عَنْ زَائِدَةَ ، عَنْ سُلَيْمَانَ ، عَنْ أَبِي صَالِحٍ ، عَنْ أَبِي هُرَيْرَةَ ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " مَنْ تَوَلَّى قَوْمًا بِغَيْرِ إِذْنِ مَوَالِيهِ فَعَلَيْهِ لَعْنَةُ اللَّهِ وَالْمَلاَئِكَةِ وَالنَّاسِ أَجْمَعِينَ لاَ يُقْبَلُ مِنْهُ يَوْمَ الْقِيَامَةِ عَدْلٌ وَلاَ صَرْفٌ " . وَحَدَّثَنِيهِ إِبْرَاهِيمُ بْنُ دِينَارٍ ، حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُوسَى ، حَدَّثَنَا شَيْبَانُ ، عَنِ الأَعْمَشِ ، بِهَذَا الإِسْنَادِ غَيْرَ أَنَّهُ قَالَ " وَمَنْ وَالَى غَيْرَ مَوَالِيهِ بِغَيْرِ إِذْنِهِمْ " .
He who took the freed slave as his ally without the consent of his previous master, there is upon him the curse of Allah and that of His angels and that of the whole mankind, and there will not be accepted from him his obligatory acts or supercrogatory acts on the Day of Resurrection. This hadith is narrated through the same chain of transmitters, but with a slight change of words.