Musannaf Ibn Abi Shaybah

Shaybah bin Nasaah says that I traveled with Qasim bin Muhammad up to Makkah. During ablution, he would insert the fingers of his hand between the toes of his feet and pour water over them. I asked him the reason for this, so he replied that he had seen Hazrat Abdullah bin Umar (may Allah be pleased with them both) doing the same.