Sunan an-Nasa'i, Hadith 4949 ⓘ
It was narrated that Ayman said: "The (hand of) a thief is not to be cut off for less than the price of a shield." (Daif Mawquf)
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ عَطَاءٍ، وَمُجَاهِدٍ، عَنْ أَيْمَنَ، قَالَ لاَ يُقْطَعُ السَّارِقُ فِي أَقَلَّ مِنْ ثَمَنِ الْمِجَنِّ .
also referenced under: Book 46, Hadith 79 (In-Book) & Volume 5, Book 46, Hadith 4952 (DarusSalam)