Narrated Ibn 'Umar (RA): Allah's Messenger ( صلی اللہ علیہ وسلم ) overtook 'Umar bin al-Khattab when he was with a party of riders of about ten and 'Umar was swearing by his father. Allah's Messenger ( صلی اللہ علیہ وسلم ) called them and said, "Verily! Allah forbids you from swearing by your fathers. Therefore, if anyone swears, he must swear by Allah or keep silent." [Agreed upon] In a narration which is Marfu' (attributed to the Prophet) reported by Abu Dawud and an-Nasa'i from Abu Hurairah (RA) it has: "Do not swear by your fathers, nor by your mothers, nor by the rivals (set up as equals with Allah); and do not swear by Allah except when you are speaking the truth."