that the Messenger of Allah ﷺ passed through the Masjid one day, and a group of women were sitting, so he motioned his hand with the Salam - 'Abdul-Hamid (one of the narrators) gestured with his hand.  

أَنَّ رَسُولَ اللَّهِ ﷺ مَرَّ فِي الْمَسْجِدِ يَوْمًا وَعُصْبَةٌ مِنَ النِّسَاءِ قُعُودٌ فَأَلْوَى بِيَدِهِ بِالتَّسْلِيمِ وَأَشَارَ عَبْدُ الْحَمِيدِ بِيَدِهِ