´It was narrated from Mutarrif that his father said:` "I came to the Prophet (ﷺ) when he was praying, and there was a sound coming from his chest like the sound of water boiling," meaning, he was weeping.
Hadith ReferenceSunan an-Nasa'i / The Book of Forgetfulness (In Prayer) / Hadith: 1215
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده صحيح