John Gill Commentary Psalms 129:5

"Let them be put to shame and turned backward, All they that hate Zion." — Psalms 129:5 (ASV)

Let them all be confounded
Or "ashamed": as all the enemies of God's people will be sooner or later, either in this world, or however when Christ shall come in the clouds of heaven; or let them be disappointed of their views, aims, and ends, when they will be confounded, as disappointed persons are;

and turned back ;
from pursuing their designs and accomplishing them; as the Assyrian monarch was, who had a hook put into his nose, and a bridle in his lips, and was turned back by the way he came, (Isaiah 37:29) ;

that hate Zion ;
the inhabitants of Zion, who are called out of the world, and separated from the men of it, and therefore hated by them; the King of Zion, the Messiah, whom they will not have to reign over them; the doctrines of the Gospel, the word that comes out of Zion, to which they are utter enemies; and the laws and ordinances of Zion, the discipline of God's house, which they cannot bear to be under and submit unto.