أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ مَنْصُورٍ، عَنْ مُجَاهِدٍ، عَنْ أَيْمَنَ، قَالَ لَمْ تَكُنْ تُقْطَعُ الْيَدُ عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم إِلاَّ فِي ثَمَنِ الْمِجَنِّ وَقِيمَتُهُ يَوْمَئِذٍ دِينَارٌ .
It was narrated that Ayman said:
"The hand of a thief would not be cut off during the time of the Messenger of Allah except for the value of a shield, which in those days was a Dinar."
Reference: Sunan an-Nasa'i 4944
In-book : Book 46, Hadith 74
English translation : Vol. 5, Book 46, Hadith 4947