الْأَدَبُ الْمُفْرَدُ
Al-Adab al-Mufrad 1170
Behaviour with people
When there are four people
وَحَدَّثَنِي أَبُو صَالِحٍ، عَنِ ابْنِ عُمَرَ، عَنِ النَّبِيِّ صلى الله عليه وسلم مِثْلَهُ، قُلْنَا: فَإِنْ كَانُوا أَرْبَعَةً؟ قَالَ: لا يَضُرُّهُ.
Ibn 'Umar reported something similar from the Prophet, (ﷺ). He stated, "We said, 'If there are four?' He said, 'Then it will not harm him.'"
Al-Adab Al-Mufrad, 1170Sahih (Al-Albani)صـحـيـح (الألباني)