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 (PBUH) spit and then rub it with his left foot." Translation Not Available
Book Ref: Sunan An Nisai Book 8 Hadith 727
Web Ref: Sunan An Nisai Vol 1 Book 8 Hadith 728