Hadith 7:43
Narrated Ibn Mas'ud (RA):
If anyone buys a goat whose udder has been tied up and he returned it, he must return it with one Sa'. [Reported by al-Bukhari].
وَعَنِ اِبْنِ مَسْعُودٍ - رضى الله عنه - قَالَ: { مَنِ اِشْتَرَى شَاةً مَحَفَّلَةً, فَرَدَّهَا, فَلْيَرُدَّ مَعَهَا صَاعًا } رَوَاهُ اَلْبُخَارِيُّ