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