Sunan an-Nasa'i 4848
سنن النسائي#4848Sahihأَخْبَرَنَا نَصْرُ بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، فَهَذِهِ وَهَذِهِ سَوَاءٌ الإِبْهَامُ وَالْخِنْصَرُ .
It was narrated from Ibn 'Abbas:"This and this are the same: The little finger and the thumb (sahih)
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Abu GhuddahSahih Isnaad Mauquf
Al-AlbaniSahih Isnaad Mauquf
Zubair Ali ZaiHasan
In-book reference: 45:143