عَنْ مُطَرِّفٍ عَنْ أَبِيهِ رَضِيَ اللَّهُ عَنْهُ قَالَ: انْتَهَيْتُ إِلَى رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ وَهُوَ يُصَلِّي وَلِصَدْرِهِ أَزِيزٌ كَأَزِيزِ الْمِرْجَلِ
Mutarrif narrates from his father, and he says: I came to the Messenger of Allah, peace and blessings be upon him, while he was praying, and from his chest there was a sound like the boiling of a pot.