"I saw the Messenger of Allah performing ablution, and he ran his little finger between his toes." (Sahih) Another chain with similar wording.  

رَأَيْتُ رَسُولَ اللَّهِ ﷺ تَوَضَّأَ فَخَلَّلَ أَصَابِعَ رِجْلَيْهِ بِخِنْصِرِهِ قَالَ أَبُو الْحَسَنِ بْنُ سَلَمَةَ حَدَّثَنَا خَازِمُ بْنُ يَحْيَى الْحُلْوَانِيُّ حَدَّثَنَا قُتَيْبَةُ حَدَّثَنَا ابْنُ لَهِيعَةَ فَذَكَرَ نَحْوَهُ  

'The Messenger of Allah said: 'When you get up for prayer, perform ablution properly and make the water run between your toes and your fingers.'"  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا قُمْتَ إِلَى الصَّلاَةِ فَأَسْبِغِ الْوُضُوءَ وَاجْعَلِ الْمَاءَ بَيْنَ أَصَابِعِ يَدَيْكَ وَرِجْلَيْكَ  

"The Messenger of Allah said: perform ablution properly and let the water run between your fingers."  

قَالَ رَسُولُ اللَّهِ ﷺ أَسْبِغِ الْوُضُوءَ وَخَلِّلْ بَيْنَ الأَصَابِعِ  

Whenever the Messenger of Allah performed ablution, he moved his ring.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا تَوَضَّأَ حَرَّكَ خَاتَمَهُ