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).’”
Reference: Jami` at-Tirmidhi 3383 In-book : Book 48, Hadith 14 English translation : Vol. 6, Book 45, Hadith 3383
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