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