Sunan an-Nasa'i 4847
سنن النسائي#4847SahihIt was narrated from Ibn 'Abbas that the Propher said:"this and this are the same,": meaning the little finger and the thumb
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Bukhari
In-book reference: 45:142