Tafsir of Al-Qalam 68:10

And do not obey every Hallaf (one who swears much) Mahin (liar or worthless person). This is because the liar, due to his weakness and his disgracefulness, only seeks protection in his false oaths which he boldly swears to while using Allah's Names, and he uses them (false oaths) all the time and out of place (i.e., unnecessarily). Ibn `Abbas said, "Al-Mahin means the liar.'' Then Allah says,