(44, 45) باب عَقْلِ الأَصَابِعِ
It was narrated from Ibn 'Abbas:
"This and this are the same: The little finger and the thumb (sahih) (IT)
Reference (IT): Sunan an-Nasa'i 4848 (IT)
In-book reference (IT): Book 45, Hadith 143 (IT)
English translation (IT): Vol. 5, Book 45, Hadith 4852 (IT)