תהילים קיט:קיז פירוש: רש״י

and I shall constantly engage in Your statutes Heb. ואשעה, and I shall engage, like (Exod. 5: 9): “and let them not engage (ישעו) in useless things.” Another explanation: [It is] an expression of telling and reciting, as we translate (Deut. 28:37): “and a recitation (ולשועין).”