18يَومَ يَبعَثُهُمُ اللَّهُ جَميعًا فَيَحلِفونَ لَهُ كَما يَحلِفونَ لَكُم ۖ وَيَحسَبونَ أَنَّهُم عَلىٰ شَيءٍ ۚ أَلا إِنَّهُم هُمُ الكاذِبونَMuhammad AsadOn the Day when God will raise them all from the dead, they will swear before Him as they [now] swear before you, thinking that they are on firm ground [in their assumptions].1 Oh, verily, it is they, they who are the [greatest] liars!2Namely, that their preference of worldly benefits to a spiritual commitment is "reasonable" and, therefore, morally "justified". It is to this flagrant self-deception that the next sentence refers.The definite article al prefixed to the participial noun kadhibun indicates that the people thus characterized have reached the utmost degree of self-deception; hence my interpolation of the adjective "greatest" in consonance with Zamakhshari's interpretation of the above phrase.