Jami` at-Tirmidhi 39
جامع الترمذي#39SahihIbn Abbas narrated that :Allah's Messenger said: "When performing Wudu go between the fingers of your hands and (toes of) your feet
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirHasan Sahih
Al-AlbaniHasan Sahih
Bashar Awad MaaroufHasan
Zubair Ali ZaiHasan
In-book reference: 1:39