From Sahih Muslim (Hadith 1340):
Warrad, the freed slave of Mughira b. Shu'ba, reported:Mughira b. Shu'ba wrote to Mu'awiya (it was Warrad who wrote this letter for him, i. e. Mughira): I heard the Messenger of Allah (ﷺ) saying:" When the salutation is pronounced." and the rest of the hadith is the same except this that he made no mention of:" He is Potent over everything
Reference: Muslim 1340