Sahih Muslim · Hadith 3864

حدثنا قتيبة بن سعيد، حدثنا يعقوب، - يعني ابن عبد الرحمن القاري - عن سهيل، عن أبيه، عن أبي هريرة، أن رسول الله صلى الله عليه وسلم قال ‏"‏ من تولى قوما بغير إذن مواليه فعليه لعنة الله والملائكة لا يقبل منه عدل ولا صرف ‏"‏ ‏.‏

Abu Huraira (Allah be pleased with him) reported that Allah's Messenger (may peace be upon him) said: He who takes anyone as his ally without the consent of his previous master, there will be the curse of Allah and that of His angels upon him, and neither, any obligatory act of his nor the supererogatory one will be accepted (by Allah).

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).