Let them be ashamed: The verbs in the preceding verse, in which the psalmist simply prays for deliverance, are in the imperative; but here, and in the following verses, they are in the future tense, and naturally express the language of lively faith and hope, rather than that of wishing the destruction foreseen and predicted. Psa 31:17-18, Psa 35:4, Psa 35:26, Psa 70:2-3, Psa 71:13; Isa 41:11, Isa 45:24