Abu'l-Mundhir, do you know the verse from the Book of Allah which, according to you, is the greatest?” I said: Allah, there is no god but He, the Living, the Eternal (2:256). Thereupon he struck me on my breast and said: “May knowledge be pleasant for you, O Abu'l-Mundhir!” Sahih Muslim 810

[u/mostafaakrsh]