Kathir bin Frqd al-Madni كثير بن فرقد المدني · The Book of Financial Transactions

"Do not go out to meet the riders, and do not bind the udders of camels and seep. Whoever has boughty anything in that manner has two choices: If he whishes he may keep it, or if he wants to return it he may return it, along with a Sa of dates." (Sahih )