´It was narrated that Mustawarid bin Shaddad said:` "I saw the Messenger of Allah performing ablution, and he ran his little finger between his toes." (Sahih) Another chain with similar wording.
Related hadith on this topic
Explanation & Benefits
Maulana Ataullah Sajid
Commentary:
Sometimes, due to water not reaching properly between the fingers of the hands and feet, some areas remain dry; therefore, one should perform khilal (passing the fingers through each other) of them.
The mention of khilal of the fingers of the hands is coming in the next hadith.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 446
Shaykh Dr. Abdur Rahman Freywai
Urdu Footnote:
Note:
(In the chain of narration, Abdullah bin Lahi'ah is weak, but on the basis of corroborating evidences, this hadith is sahih li ghayrihi [authentic due to supporting narrations].)
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 40
Shaykh Umar Farooq Saeedi
Benefits and Issues:
It is understood that one should also perform khilal (passing the fingers through) of the toes so that there remains no possibility of any area remaining dry.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 148