Sahih al-Bukhari 2082

Badal ibn al-Muhabbar narrated to us: Shuaba narrated to us, from Qatada, who said: I heard Abu al-Khalil narrate from Abd Allah ibn al-Harith, from Hakim ibn Hizam, may Allah be pleased with him, from the Prophet, peace and blessings be upon him, who said: “The buyer and seller have the option as long as they have not separated—or he said, until they separate. If they are truthful and make matters clear, their sale will be blessed for them; but if they conceal and lie, the blessing of their sale will be erased.”