Adam Clarke on Psalms 25:3

Let none that wait on thee be ashamed - Though he had burden enough of his own, he felt for others in similar circumstances, and became an intercessor in their behalf.

Transgress without cause - Perhaps בוגדים bogedim may here mean idolatrous persons. "Let not them that wait upon and worship thee be ashamed: but they shall be ashamed who vainly worship, or trust in false gods." See Mal 2:11-16. The Chaldeans have evil entreated us, and oppressed us: they trust in their idols, let them see the vanity of their idolatry.