Hadith 4760
Umm Salamah, wife of the Prophet ﷺ is reported to have said: The Messenger of Allah ﷺ said: You will have commanders some of whom you will approve and some of whom you will disapprove. He who expresses disapproval with his tongue (Abu Dawud said: This is Hisham’s version) is guiltless; and he who feels disapproval in his heart, is safe, but he who is pleased and follows them. He was asked; shall we not kill them, Messenger of Allah? Abu Dawud’s version has: Shall we not fight with them? He replied: No, so long as they pray.
Hadith 4761
The tradition mentioned above has also been transmitted by Umm Salamah through a different chain of narrators to the same effect. This version has: He who disapproves is guiltless, and he who disapproves is safe. Qatadah said: it means one who feels its disapproval in his heart, and one who expresses disapproval in his heart.