(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. (PT)
Reference (PT): Sunan an-Nasa'i 1214 (PT)
In-book reference (PT): Book 13, Hadith 36 (PT)
English translation (PT): Vol. 2, Book 13, Hadith 1215 (PT)