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