Sunan an-Nasa'i
It was narrated from 'Amrah that 'Aishah said: "Cutting off (the hand of the thief) is for one-quarter of a Dinar or more."
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ يَحْيَى بْنِ سَعِيدٍ، وَعَبْدِ، رَبِّهِ وَرُزَيْقٍ صَاحِبِ أَيْلَةَ أَنَّهُمْ سَمِعُوا عَمْرَةَ عَنْ عَائِشَةَ قَالَتِ الْقَطْعُ فِي رُبُعِ دِينَارٍ فَصَاعِدًا .
Grade: Sahih (Darussalam)
Reference