I saw the Messenger of Allah ﷺ rubbing his toes with his little finger when he performed ablution.  

رَأَيْتُ رَسُولَ اللَّهِ ﷺ إِذَا تَوَضَّأَ يَدْلُكُ أَصَابِعَ رِجْلَيْهِ بِخِنْصَرِهِ  

"I saw the Prophet when he was performing Wudu doing that to the toes on his feet with his pinky."  

رَأَيْتُ النَّبِيَّ ﷺ إِذَا تَوَضَّأَ دَلَكَ أَصَابِعَ رِجْلَيْهِ بِخِنْصَرِهِ  

[Machine] Narrated by Al-Mustawrid ibn Shaddad, the companion of the Prophet ﷺ , he said: "I saw the Messenger of Allah ﷺ when he performed ablution, he would intertwine the fingers of his feet with his little finger."  

عَنِ الْمُسْتَوْرِدِ بْنِ شَدَّادٍ صَاحِبِ النَّبِيِّ ﷺ قَالَ رَأَيْتُ رَسُولَاللهِ ﷺ إِذَا تَوَضَّأَ خَلَّلَ أَصَابِعَ رِجْلَيْهِ بِخِنْصَرِهِ  

[Machine] Narrated by Al-Mustawrid ibn Shaddad, the companion of the Prophet ﷺ , he said, "I saw the Messenger of Allah ﷺ when he performed ablution, he used to pass his little finger three times between his toes."  

عَنِ الْمُسْتَوْرِدِ بْنِ شَدَّادٍ صَاحِبِ النَّبِيِّ ﷺ قَالَ رَأَيْتُ رَسُولَ اللهِ ﷺ إِذَا تَوَضَّأَ يُخَلِّلُ أَصَابِعَ رِجْلَيْهِ بِخِنْصَرِهِ  

The Messenger of Allah ﷺ said: "When you perform Wudu', do so properly, and wash in between the fingers (Al-Asabi')."[2] [1] Al-Asabi' is plural meaning fingers as well as toes, and the author mentioned only one narration on the topic whereas some of them clarify "of the hands and feet." So he mentioned the general wording amids chapters how to wash the feet. [2] Part of this narration preceded under No. 87. (Using translation from Nasāʾī 114)   

قَالَ رَسُولُ اللَّهِ ﷺ «إِذَا تَوَضَّأْتَ فَخَلِّلِ الْأَصَابِعَ»