Iyyaka wal-kadhib, fa’innal-kadhiba yahdi ilal-fujur. Wa innal-fujura yahdi ilan-nar. Wala yazalul-^abdu yakdhibu wa yataharral-khadhiba hatta yuktaba ^indallahi kadhdhaba.

Which means: “Do not ever lie, because lying leads to very abhorrent sins, and those in turn lead to Hellfire. One keeps on lying and seeks to do that until one is recorded as a liar in some books of Allah.” (Narrated by Ibn Majah.)

 There are many things that are among the sins of the tongue and fall under the category of lying. They include: swearing by Allah to a lie, false testimony, and falsely attributing something to Allah and His Prophet.

   1-    Swearing by Allah to a Lie: It is one of the major sins. It is for one to swear by Allah to something that is opposite to the truth. An example is if one says, “By Allah, I did such and such” while knowing that one did not do that action. Similarly, if one says, “By Allah I did not do such and such” when one has done it. This is considered using God’s name in vain, which indicates falling short of glorifying Allah properly.