"The Messenger of Allah(ﷺ) said: (About saying) La ilaha illah - no deed takes precedence over it and it does not leave any sin.'"
Sunan Ibn Majah Book 33, Hadith 141
← Previous Hadith Messenger of Allah(ﷺ) said: "There is no soul that died bearing witness to La ilaha illallah, and that I am the Messenger of Allah, from the heart with certainity, but Allah will forgive it."

Sunan Ibn Majah Book 33, Hadith 140 Next Hadith → the Messenger of Allah(ﷺ) said: "Whoever says one hundered times each day: La ilaha illahu wahdahu la sharikalahu, wa lahul-mulku wa lahul hamduwa huwa ala kulli shayin qadeer (None has the right to be worshipped but Allah alone, with no partner or associate. His is the dominion, all praise is to Him, and He is able to do all things), it will be equivalent to him freeing ten slaves, and one hundered merits will be recorded for him, and one hundered bad deeds will be erased from (his record), and it will be a protection for him against Satan all day until night comes. No one can do anything better then him except one who says more.'"

Sunan Ibn Majah Book 33, Hadith 142