It was narrated that Ibn Muhairiz said:
"I asked Fadalah bin Ubaid about hanging the hand (of the thief) from this neck, and he said: 'It is sunnah. The messenger of Allah (ﷺ) cut off a man's hand then hung it from his neck''' (FR)
English reference (FR): Vol. 3, Book 20, Hadith 2587 (FR)
Arabic reference (FR): Book 20, Hadith 2685 (FR)