It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that there was a dispute between two men. One of them was required to take an oath, so he swore: "By Allah, besides whom there is no deity, this person has no right over me." Meanwhile, Hazrat Jibreel (peace be upon him) descended and said: "Order him to give the other his due; the right belongs to him, and he (the one who swore) is lying. The expiation for his false oath is that he bears witness to the oneness of Allah and acknowledges His recognition."