Isaiah 28:15

Overview - Isaiah 28
The prophet threatens Ephraim for their pride and drunkenness.
The residue shall be advanced in the kingdom of Christ.
He rebukes their error;
their untowardness to learn;
14 and their security.
16 Christ the sure foundation is promised.
17 Their security shall be tried.
23 They are incited to the consideration of God's discreet providence.
Treasury of Scripture Knowledge

Isaiah 28:15  (King James Version)
Because ye have said, We have made a covenant with death, and with hell are we at agreement; when the overflowing scourge shall pass through, it shall not come unto us: for we have made lies our refuge, and under falsehood have we hid ourselves:

We have
To be in covenant with a thing, says Bp. Lowth, is a proverbial expression to denote perfect security from mischief or evil of which it is the cause.
Isaiah 5:18 Isaiah 5:19 Ecclesiastes 8:8 ; Job 5:23 ; 15:25-27 Jeremiah 44:17 ; Ezekiel 8:12 ; Hosea 2:18
Zephaniah 1:12

Isaiah 8:7 Isaiah 8:8 Daniel 11:22

we have made
30:10 Jeremiah 5:31 ; 14:13 16:19 28:15-17 Ezekiel 13:16 Ezekiel 13:22 ; Amos 2:4
Jonah 2:8 ; 2 Thessalonians 2:9-11