Psalm 37:13 New English Translation

¹³The Lord laughs in disgust^[a] at them,
for he knows that their day is coming.^[b]

Psalm 37:13 tn Heb “laughs.” As the next line indicates, this refers to derisive laughter (see 2:4). The Hebrew imperfect verbal form describes the action from the perspective of an eye-witness who is watching the divine response as it unfolds before his eyes.
Psalm 37:13 tn Heb “for he sees that his day is coming.” As the following context makes clear (vv. 15, 17, 19-20), “his day” refers to the time when God will destroy evildoers.

New English Translation (NET)