Yahya bin Abi Ishaq (may Allah have mercy on him) reports that he said to Sayyiduna Anas bin Malik (may Allah be pleased with him): "O Abu Hamzah! One of us lends someone money, and then he is given a gift (by the borrower); (may he accept it)?" He said: The Messenger of Allah (peace and blessings be upon him) said: "When one of you gives a loan, and then he is given a gift or is given a ride on a mount, let him not accept it nor ride it, unless such (exchange of gifts and rides) had already been the practice between the two of them before (this loan)."
This hadith is not narrated from the Messenger of Allah (peace and blessings be upon him) except with this chain, and Utbah bin Humayd (may Allah have mercy on him) is alone in narrating it.
Hadith Referenceالمعجم الأوسط / باب العين / 4585
Hadith Takhrij«أخرجه ابن ماجه فى «سننه» برقم: 2432، والبيهقي فى «السنن الكبرى» برقم: 11045، 11046، والطحاوي فى «شرح مشكل الآثار» (11/116) [دون رقم في الترقيم المختار]»