Albert Barnes Commentary Ecclesiastes 9:2

"All things come alike to all: there is one event to the righteous and to the wicked; to the good and to the clean and to the unclean; to him that sacrificeth and to him that sacrificeth not; as is the good, so is the sinner; [and] he that sweareth, as he that feareth an oath." — Ecclesiastes 9:2 (ASV)

Event - See Ecclesiastes 2:14 note.

Swears - that is, swears lightly or profanely.