[Machine] A man witnessed that the Prophet ﷺ said: "Indeed, circumambulation is a form of prayer, so when you are performing it, speak less and do not raise your voice." (No reference mentioned)  

عَنْ رَجُلٍ أَدْرَكَ النَّبِيَّ ﷺ أَنَّ النَّبِيَّ ﷺ قَالَ إِنَّمَا الطَّوَافُ صَلَاةٌ فَإِذَا طُفْتُمْ فَأَقِلُّوا الْكَلَامَ وَلَمْ يَرْفَعْهُ ابْنُ بَكْرٍ