Psalms 139:11

“If I say, surely the darkness shall cover me, etc.] The darkness of a cloud or of the night, so that my actions shall not be seen; that is, if I entertain such a thought in my mind, that what I do in the dark will escape the sight and knowledge of God, and so be emboldened to commit it; even the night shall be light about me; and make all my works manifest, as light does.”

“If I say, Surely the darkness shall cover me - If I seek to find refuge in the darkness of the night so that God would not see me. The word rendered “cover” - שׁוף shûph - means properly to snap, to gape after; then, to lie in wait for; and then, to attack, or fall upon anyone, unexpectedly. It is rendered “bruise” (twice) in Genesis 3:15, “He shall “bruise” thy head, and thou shalt “bruise” his heel;” “breaketh” in Job 9:17, “He “breaketh” me with a tempest;” and in this place “cover.” It does not occur elsewhere. Here it means to fall upon; to overpower; to cover. The idea is, If it should come suddenly upon me; if I should be involved in sudden darkness - “as if” the darkness should come…”

“Surely: Psa 10:11-13, Psa 94:7; Job 22:12-14; Isa 29:15; Jer 23:24 even the night: Job 12:22 Psalms 139:12”