Mishkat al-Masabih#4865
وَعَن عِمْرَانَ بْنِ حُصَيْنٍ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَقَامُ الرَّجُلِ بِالصَّمْتِ أَفْضَلُ مِنْ عِبَادَةِ سِتِّينَ سنة»
Abu Mas'ud al-Badri reported: I was beating a slave of mine with a whip when I heard a voice behind me saying: "Know, O ...