﴿ وَإِذَا رَأَوْا۟ ءَايَةًۭ يَسْتَسْخِرُونَ ﴾

“and when they become aware of a [divine] message, they turn it to ridicule”

(And seek to scoff when they) the people of Mecca (behold a portent) a sign such as the splitting of the moon and the eclipse of the sun.