الطلاق : Hadeeth No:3599
Abu Huraira (Allaah be pleased with him) reported that Allaah's Messenger (sallAllaahu alayhi wa sallam) said: He who takes anyone as his ally without the consent of his previous master, there will be the curse of Allaah and that of His angels upon him, and neither, any obligatory act of his nor the...
الصلاة : Hadeeth No:1565
A hadith like this has been narrated by Shu'ba with the same chain of transmitters....