بُلُوغُ الْمَرَامِ
Bulugh al-Maram 815
Business Transactions
وَعَنِ اِبْنِ مَسْعُودٍ - رضى الله عنه - قَالَ: { مَنِ اِشْتَرَى شَاةً مَحَفَّلَةً, فَرَدَّهَا, فَلْيَرُدَّ مَعَهَا صَاعًا } رَوَاهُ اَلْبُخَارِيُّ [1] .
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].
Sunnah.com reference: Book 7, Hadith 43