Matthew Poole and continuators on Psalms 64:4

4. That they may shoot in secret at the perfect : suddenly do they shoot at him, and fear not .

Lying in Ambush, or hiding themselves in secret places, as Fowlers commonly do.

Or, upright Man; (i. e.) At me, who in spight of all their Calumnies, dare avow that my Heart is perfect with God, and that I am blameless as to them, having given them no just Provocation.

At the very first Opportunity.

Neither men, because they conceal it from them, as appears from the foregoing and following Words; nor God, whose Judgments they despise.