(18) باب الْبُكَاءِ فِي الصَّلاَةِ
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. (JA)
Reference (JA): Sunan an-Nasa'i 1214 (JA)
In-book reference (JA): Book 13, Hadith 36 (JA)
English translation (JA): Vol. 2, Book 13, Hadith 1215 (JA)