Jami` at-Tirmidhi 3107
جامع الترمذي#3107Da'ifNarrated Ibn 'Abbas:that the Messenger of Allah (ﷺ) said: "When Allah drowned Fir'awn he said: 'I believe that there is no god except the One that the children of Isra'il believe in.' So Jibrail said: 'O Muhammad! If you could only have seen me, while I was taking (the mud) from the sea, and filling his mouth out of fear that the mercy would reach him
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih Lighairihi
Al-AlbaniSahih
Zubair Ali ZaiDaif
In-book reference: 47:159