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yawma yabʿathuhumu llāhu jamīʿan fa-yaḥlifūna lahū ka-mā yaḥlifūna lakum wa-yaḥsabūna ʾannahum ʿalā shayʾin ʾa-lā ʾinnahum humu l-kādhibūna
The day when Allah will raise them all together, they will swear to Him, just like they swear to you [now], supposing that they stand on something. Look! They are indeed liars!
— Ali Quli Qarai
Surah Mujadila - Verse 18
18. On the Day when Allah will resurrect them all together, they will swear to Him as they swear to you imagining that they rely on something. Indeed, they are liars.
When lying turns into a natural disposition, liars even falsely swear on the Day of Resurrection. Thus, the blessed Verse in question is reminding people of the Day when God Almighty shall resurrect them and He shall present their evil deeds unto them. God Almighty shall question them at His Just Tribunal, but they falsely swear to Him in the same manner that they falsely swore to people in this world. The Day of Resurrection shall be the scene of manifestation of human deeds and intentions.
Hypocrites take their intentions and deeds to their graves and purgatory, but they shall be manifest on the Day of Resurrection. They know that God Almighty is All-Aware of the Unseen. Nothing is concealed from Him. However, they are habitually inclined toward taking false oaths. The blessed Verse proceeds to say: They imagine that they rely on something through taking such false oaths and may thereby gain benefits and ward off loss, but it will be sheer illusions. They had been accustomed to resort to such pretexts in order to ward off predicaments and losses from themselves, hence the reinforcement of such natural dispositions and their manifestations.
The blessed Verse closes by saying:
They are disgraced before all men in this world and the Hereafter.