عَنْ أَبِي عُثْمَانَ عَنِ ابْنِ مَسْعُودٍ رَضِيَ اللَّهُ عَنْهُ مَنِ اشْتَرَى مُحَفَّلَةً وَرُبَّمَا قَالَ شَاةً مُحَفَّلَةً فَلْيَرُدَّهَا وَلْيَرُدَّ مَعَهَا صَاعًا وَنَهَى النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ عَنْ تَلَقِّي الْبُيُوعِ
Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) says: Whoever buys a goat whose milk has been withheld, he (if he wishes) may return it, but along with it he should also return one sa’ (measure), and the Noble Prophet (peace and blessings of Allah be upon him) forbade meeting caravans on the way.