42فَذَرهُم يَخوضوا وَيَلعَبوا حَتّىٰ يُلاقوا يَومَهُمُ الَّذي يوعَدونَMuhammad AsadHence, leave them to indulge in idle talk and play [with words]1 until they face that [Judgment] Day of theirs which they have been promisedI.e., their philosophizing about a supposedly "uncreated" world and a hypothetical "self-generation" of life, as well as their blatant "denial", unsupported by any factual evidence, of a life after death or even of the existence of God.