He prayed with the Messenger of Allah ﷺ and spat, then rubbed it away with his left sandal.
حدثنا إسماعيل بن إبراهيم عن الجريري
أنه صلى مع رسول الله ﷺ فتنخع فدلكها بنعله اليسرى
Its isnad is sahih, mentioned previously at 16262.