﴿ فَذَرْهُمْ يَخُوضُوا۟ وَيَلْعَبُوا۟ حَتَّىٰ يُلَٰقُوا۟ يَوْمَهُمُ ٱلَّذِى يُوعَدُونَ ﴾

“Hence, leave them to indulge in idle talk and play [with words] until they face that [Judgment] Day of theirs which they have been promised –”

(So let them) O Muhammad, i.e. let those who mock you and the other disbelievers (chat) about falsehood (and play) and mock you while continuing to be disbelievers (until they meet) until they behold (their Day which they are promised) in which they are promised chastisement,