سنن النسائي

It was narrated from Warrad that: Mu'awiyah wrote to Al-Mughirah asking him to write him a hadith that he had heard from the Messenger of Allah (ﷺ). Al-Mughirah wrote to him (Saying): "I heard him say, when he finished the prayer: 'La Ilaha Illallah wahdahu la sharika lah, lahul-mulk wa lahul-hamd wa huwa 'ala kulli shay'in qadir (There is none worthy of worship except Allah (ﷺ) alone with no partner or associate. He is the Dominion and to Him be all praise, and He is able to do all things) three times."