The Book of Legal Punishments
وَحَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا حُمَيْدُ بْنُ عَبْدِ الرَّحْمَنِ الرُّؤَاسِيُّ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، قَالَتْ لَمْ تُقْطَعْ يَدُ سَارِقٍ فِي عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي أَقَلَّ مِنْ ثَمَنِ الْمِجَنِّ حَجَفَةٍ أَوْ تُرْسٍ وَكِلاَهُمَا ذُو ثَمَنٍ .A'isha reported that during the lifetime of Allah's Messenger (ﷺ) the hand of the thief was not cut off for less than the price of a shield, iron coat or armour and both of them are valuable
From Sahih Muslim, whose reports the scholars accept as authentic.