سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 727
The Book of the Masjids
With Which Foot Should He Rub (His Spittle)?
أَخْبَرَنَا سُوَيْدُ بْنُ نَصْرٍ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ، عَنْ سَعِيدٍ الْجُرَيْرِيِّ، عَنْ أَبِي الْعَلاَءِ بْنِ الشِّخِّيرِ، عَنْ أَبِيهِ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم تَنَخَّعَ فَدَلَكَهُ بِرِجْلِهِ الْيُسْرَى .
It was narrated from Abu Al-'Ala' bin Ash-Shikhir that his father said: "I saw the Messenger of Allah (ﷺ) spit and then rub it with his left foot."
Sunan an-Nasa'i, 727Sahih (Darussalam)