Ayyub (may Allah have mercy on him) also narrates the same meaning: "If he returns it, he should give a sa' of dates as well, not wheat." And some narrated from Ibn Sirin (may Allah have mercy on him): "He should give a vessel of grain."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10719