John Gill Commentary Psalms 109:3

"They have compassed me about also with words of hatred, And fought against me without a cause." — Psalms 109:3 (ASV)

They compassed me about also with words of hatred
They surrounded him as he hung on the cross, and expressed their malice and hatred against him; then was he enclosed with these spiteful snarling dogs, and encompassed by them as with so many bees, who everyone left their sting in him, (Psalms 22:16) (118:12) .

And fought against me without a cause :
they were of an hostile spirit, enemies and enmity itself against him; fought against him both with words and blows, with their tongues and with their fists; sought his life, and at length took it away; he was attacked by the body of the Jewish nation, and by the whole posse of devils.

And all this without any cause or just reason: he gave them no occasion for this enmity and malice, and opposition to him; and it was in the issue without effect, it was in vain and to no purpose; for though they gained their point in putting him to death, yet he rose again a triumphant Conqueror over them all.