Narrated Mutarrif bin Abdullah bin Shikhkhir (RA) from his father, who said, "I saw Allah's Messenger (ﷺ) when he was engaged in prayer, and heard a sound from his chest, like the bubbling of a pot, from weeping." [Reported by al-Khamsah except Ibn Majah, and Ibn Hibban graded it Sahih (authentic)].