(5) باب مَا جَاءَ فِي التَّخَتُّمِ فِي الْيَمِينِ أَوِ الْيَسَارِ
Nafi' said that Ibn 'Umar used to wear his signet-ring on his left hand.
Reference: Sunan Abi Dawud 4228
In-book reference: Book 36, Hadith 15
English translation: Book 35, Hadith 4216