Sunan an-Nasa'i, Book 46, Hadith 73 (In-Book) ⓘ
It was narrated that Ayman said: "The Prophet did not cut off the (hand of) the thief except for the value of a shield, and the value of a shield in those days was a Dinar." (Daif)
وَأَخْبَرَنَا مَحْمُودُ بْنُ غَيْلاَنَ، قَالَ حَدَّثَنَا مُعَاوِيَةُ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ مَنْصُورٍ، عَنْ مُجَاهِدٍ، عَنْ عَطَاءٍ، عَنْ أَيْمَنَ، قَالَ لَمْ يَقْطَعِ النَّبِيُّ صلى الله عليه وسلم السَّارِقَ إِلاَّ فِي ثَمَنِ الْمِجَنِّ وَثَمَنُ الْمِجَنِّ يَوْمَئِذٍ دِينَارٌ .
also referenced under: Hadith 4943 (Reference) & Volume 5, Book 46, Hadith 4946 (DarusSalam)