مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 3528
Retaliation
Offences for which no Responsibility is Incurred - Section 2
وَعَن الحسنِ عَنْ سَمُرَةَ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَهَى أَنْ يُقَدَّ السَّيْرُ بَيْنَ أُصبعَينِ. رَوَاهُ أَبُو دَاوُد
Al-Hasan said on Samura’s authority that God’s Messenger forbade that a thong of a sandal should be cut off between two toes. Abu Dawud transmitted it.
Mishkat al-Masabih, 3528