Albert Barnes Commentary Psalms 101:3

"I will set no base thing before mine eyes: I hate the work of them that turn aside; It shall not cleave unto me." — Psalms 101:3 (ASV)

I will set no wicked thing before my eyes - That is, I will propose no wicked thing to be done; I will have no such object in view; I will employ no one to do that which is wrong. The margin, as the Hebrew, is, “thing of Belial.” See the notes at (Psalms 41:8). Here, it means that which is worthless, bad, wicked. He would have no wicked aim; he would not look upon a wicked thing for a moment, or with the least favor.

I hate the work of those who turn aside - All their doings, motives, plans. The word rendered “turn aside” means to turn out of the way, out of the right path: wanderers, transgressors, those who leave the path of truth and honesty.

It shall not cleave to me - I will have nothing to do with it. It shall not be allowed to attach itself to me. A wicked plan or purpose is thus represented as having a tendency to fasten itself on a man, or to “stick to him”—as pitch, or wax, as a “burn” does.