Nobody Will Be Able To Lie In The Hereafter
Those who lie and act deceitfully in this world, while forgetting that they will be called to account in the Hereafter for all that they have done and said, will not be able to find the strength to lie in the Hereafter. Even if they want to lie, Allah will give them no chance to do so, will seal up their mouths, and will enable their bodily parts to declare, against their owner's will, the truth of that which they were made to do.
Allah tells us, in several verses, that all liars will betray themselves:
Today We seal up their mouths, and their hands speak to us and their feet bear witness to what they have earned. (Surah Ya Sin, 36:65)
When they reach it [the Fire], their hearing, sight, and skin will testify against them concerning what they did. They will ask their skins: "Why did you testify against us?" and they will reply: "Allah gave us speech, as He has given speech to everything. He created you in the first place, and you will be returned to Him. You did not think to shield yourselves from your hearing, sight, and skin testifying against you, and you thought that Allah would never know much of what you did. It is that thought you had about your Lord that has destroyed you, so now you find yourselves among the lost." If they are steadfast, the Fire will still be their residence! If they ask for favor, no favor will be given. (Surah Fussilat, 41:20-24)
Allah also informs us of how "a lying sinner" will be punished on the Day of Judgment and of how he or she will reveal what they have concealed within themselves, even though they may have concealed it many years ago:
No indeed! If he does not desist, We will grab him by the forelock, a lying, sinful forelock. Let him call his attendants; We will call the Guards of Hell! No indeed! Do not obey him, but prostrate and draw near. (Surat al-`Alaq, 96:15-19)Truly man is ungrateful to his Lord, and indeed he bears witness to that. Truly he is fierce in his love of wealth. Does he not know that when the graves are emptied out, and the heart's contents are brought into the open? (Surat al-`Adiyat, 100:6-10)
Liars might not be confronted with their lies in this world, for sometimes people do not notice them or, if they do, they might tolerate them. But in the Hereafter, each individual will receive the just reward for all of his or her wrongdoing. In one verse, Allah mentions that those who lie to the angels sent to take their souls at the moment of death, will find their lies rejected, and that they will receive their final "reward":
The angels ask those they take while they are wronging themselves: "What were your circumstances?" They reply; "We were oppressed on Earth." They [angles] say: "Was Allah's Earth not wide enough for you to have migrated elsewhere in it?" The shelter of such people will be Hell. What an evil destination! (Surat an-Nisa’, 4:97)
Who could do greater wrong than someone who invents lies against Allah or denies His Signs, or who says: "It has been revealed to me," when nothing has been revealed to him, or someone who says: "I will send down the same as Allah has sent down."? If you could only see the wrongdoers in the throes of death, when the angels are stretching out their hands, saying: "Disgorge your own selves! Today you will be repaid with the punishment of humiliation for saying something other than the truth about Allah..." (Surat al-An`am, 6:93)
Those who do not respect the limits set by Allah and make a habit of lying will feel great regret in the Hereafter. Those who have wisdom and a conscience should consider this end, stay away from all lies, both great and small, and always tell the truth.