The Messenger of Allah ﷺ said, "When you perform ablution, run your fingers through the gaps between the fingers of your hands and the toes of your feet."
حدثنا إبراهيم بن سعيد وهو الجوهري حدثنا سعد بن عبد الحميد بن جعفر حدثنا عبد الرحمن بن أبي الزناد عن موسى بن عقبة عن صالح مولى التوأمة
أن رسول الله ﷺ قال إذا توضأت فخلل بين أصابع يديك ورجليك
Hasan. It was also collected by Ibn Majah in the Book of Purification, Chapter on Running Water Between the Fingers, no. 447, from Ibrahim bin Saeed with the same chain, and Musa heard from Salih before he became confused in his narrations.