(4) Prayer
كتاب الصلاة
(20b) Chapter: What may not be done during Prayer and what is permitted - Section 2
(19) بَابُ مَا لَا يَجُوزُ مِنَ الْعَمَلِ فِي الصَّلَاةِ وَمَا يُبَاحُ مِنْهُ - الفصل الثاني
Mishkat al-Masabih 1000 
Mutarrif b. ‘Abdallah [b.] ash-Shikhkhir quoted his father as saying, “I came to the Prophet when he was engaged in prayer, and heard a sound from within him like the bubbling of a pot,” meaning that he was weeping. In a version he said, “I saw the Prophet praying and a sound came from his breast like the rumbling of a mill, owing to weeping.” Ahmad transmitted it. Nasa’i transmitted the first version and Abu Dawud the second.
وَعَنْ مُطَرِّفِ بْنِ عَبْدِ اللَّهِ بْنِ الشِّخِّيرِ عَنْ أَبِيهِ قَالَ: أَتَيْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَهُوَ يُصَلِّي وَلِجَوْفِهِ أَزِيزٌ كَأَزِيزِ الْمِرْجَلِ يَعْنِي: يَبْكِي وَفِي رِوَايَةٍ قَالَ: رَأَيْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُصَلِّي وَفِي صَدْرِهِ أَزِيزٌ كَأَزِيزِ الرَّحَا مِنَ الْبُكَاءِ. رَوَاهُ أَحْمَدُ وَرَوَى النَّسَائِيُّ الرِّوَايَةَ الْأُولَى وَأَبُو دَاوُدَ الثَّانِيَة
 صَحِيح  (الألباني)حكم :
Reference : Mishkat al-Masabih 1000
In-book reference : Book 4, Hadith 420