"I passed by Messenger of Allah (S) while he was performing Salat, so I said greeted him with Salam, and he returned it by making signals." He said: "I do not know except that he said: 'He indicated with his finger.'"
مَرَرْتُ بِرَسُولِ اللَّهِ ﷺ وَهُوَ يُصَلِّي فَسَلَّمْتُ عَلَيْهِ فَرَدَّ إِلَىَّ إِشَارَةً وَقَالَ لاَ أَعْلَمُ إِلاَّ أَنَّهُ قَالَ إِشَارَةً بِإِصْبَعِهِ قَالَ وَفِي الْبَابِ عَنْ بِلاَلٍ وَأَبِي هُرَيْرَةَ وَأَنَسٍ وَعَائِشَةَ