Who was it, thou or I, that did set bounds to the vast and raging ocean, and shut it up as it were with doors within its proper place and storehouse, that it might not overflow the earth; which without God's powerful restraint it would do? See Psalms 33:7, Psalms 104:9. This sense seems most proper, and to be confirmed by the following verses. When it brake forth, or, after it had broken forth, to wit, from the womb or bowels of the earth, within which the waters were for the most part contained, Genesis 1:2; compare 2 Peter 3:5; and out of which they were by God's command brought forth into the proper place or channel which God had appointed for them.
Related Commentaries of Job 38:8
Job 38:8
8 Or who shut up the sea with doors, when it brake forth, as if it had issued out of the womb?