Proverbs 30:18
There be three things which are too wonderful for me, yea, four which I know not:
Cross-reference
Proverbs 6:16
Parallel
Proverbs 6:16 uses a similar numerical proverb structure ('six things...seven'), mirroring the 'three...four' pattern in this saying.
Job 42:3
Allusion
Job 42:3 uses the identical phrase 'too wonderful for me' about things beyond understanding, paralleling the wonder expressed here.
Psalm 139:6
Allusion
Psalm 139:6 declares God's knowledge 'too wonderful for me'—similar language of awe, here applied to natural mysteries.