I came up to the Messenger of Allah ﷺ while he was praying, and from his chest came a sound like the bubbling of a boiling pot.
حدثنا عبد الرحمن بن مهدي قال حدثنا حماد بن سلمة عن ثابت
انتهيت إلى رسول الله ﷺ وهو يصلي ولصدره أزيز كأزيز المرجل
Its isnad is sahih, mentioned previously at 16264.