Hadith 36:15
Sahih in chain (Al-Albani)
Nafi' said that Ibn 'Umar used to wear his signet-ring on his left hand.
حَدَّثَنَا هَنَّادٌ، عَنْ عَبْدَةَ، عَنْ عُبَيْدِ اللَّهِ، عَنْ نَافِعٍ، أَنَّ ابْنَ عُمَرَ، كَانَ يَلْبَسُ خَاتَمَهُ فِي يَدِهِ الْيُسْرَى
Original Reference: Sunan Abi Dawud 4228