Narrated by:Ibn 'Abbas that the Propher said
It was narrated from Ibn 'Abbas that the Propher said:"this and this are the same,": meaning the little finger and the thumb.
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا شُعْبَةُ، قَالَ حَدَّثَنِي قَتَادَةُ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، رضى الله عنهما عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " هَذِهِ وَهَذِهِ سَوَاءٌ " . يَعْنِي الْخِنْصَرَ وَالإِبْهَامَ .
Nesai
The Book of Oaths (qasamah), Retaliation and Blood Money • Hadith 4847