Psalms 35:8

“Let destruction come upon him at unawares - Margin, which “he knoweth not of.” So the Hebrew. The meaning is, Let destruction come upon him when he is not looking for it, or expecting it. And let his net that he hath hid catch himself - See the notes at Psalms 7:15-16. The psalmist prays here that the same thing may occur to his enemy which his enemy had designed for him. It is simply a prayer that they might be treated as they purposed to treat him. return to 'Top of Page'”

“Let destruction: All the verbs in these verses ( Psa 35:4-8), in the original, are in the future tense, as a prediction, and should probably be so rendered; though as that tense is frequently used in Hebrew for the imperative, most translators, both ancient and modern, have considered them as an imprecation. Psa 64:7, Psa 73:18-20; Pro 29:1; Luk 21:34; Th1 5:3 at unawares: Heb. which he knoweth not of net: Psa 7:15, Psa 7:16, Psa 57:6, Psa 141:9, Psa 141:10; Pro 5:22 into: Sa1 18:17, Sa1 31:2-4; Sa2 17:2-4, Sa2 17:23, Sa2 18:14, Sa2 18:15; Est 7:10; Mat 27:3-5 Psalms 35:9”