Jabir bin `Abdullah (ra) narrated that :the Messenger of Allah (ﷺ) said: “The best remembrance is: ‘there is none worthy of worship except Allah (Lā ilāha illallāh)’ and the best supplication is: ‘All praise is due to Allah (Al-ḥamdulillāh).’”

English translation · Jami' at-Tirmidhi