It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "When you perform ablution, do khilal (pass water) between the fingers of your hands and your feet." I think that this Salih is the freed slave (mawla) of al-Taw'amah. If that is so, then it is not on the condition of this book, and I have mentioned it only as a supporting narration (shahid).