(18) My covenant.--There had been no covenant with Adam or with the Sethites, but in the higher state of things which began with Noah, man was to hold a more exactly defined relation to God; and though they had begun to attach the notion of Deity to the name Jehovah in the days of Enos (Genesis 4:26), yet it was not till the time of Moses that it became the distinct title of God in covenant with man. Of this relation a necessary result was revelation, as in no other way could there be a communication between the two contracting parties. Hence the Bible is called "The Old and New Covenant," or "The Old and New Testament," the Greek term being of wider meaning than either word with us, and signifying either an agreement between the living or the document by which a testator disposes of his property after his death (Hebrews 9:16-17). The title of covenant is more applicable to the Scriptures of the prior dispensation, which contain a series of such relations, all preparing for the last and best and most perfect, which was a Testament ratified in the blood of Christ.

Verse 18. - But with thee will I establish my covenant. בְּרית (διαθήκη, LXX.; foe-due, Vulgate; testamentum, N.T.), from בָּרַא, to cut or carve; hence a covenant, from the custom of passing between the divided pieces of the victims slain on the occasion of making such solemn compacts (cf. Genesis 15:9; Gesenius); from בָּרַה, to eat, hence an eating together, a banquet (cf. Genesis 31:54; Lee). On the Bible idea of covenant see Genesis 15:9. My covenant = the already well-known covenant which I have made with man. And thou shalt come into the ark, thou, and thy sons, and thy wife, and thy son's wives with thee. This was the substance of the covenant agreement so far as Noah was concerned. The next three verses describe the arrangements about the animals.

6:12-21 God told Noah his purpose to destroy the wicked world by water. The secret of the Lord is with them that fear him, Ps 25:14. It is with all believers, enabling them to understand and apply the declarations and warnings of the written word. God chose to do it by a flood of waters, which should drown the world. As he chooses the rod with which he corrects his children, so he chooses the sword with which he cuts off his enemies. God established his covenant with Noah. This is the first place in the Bible where the word 'covenant' is found; it seems to mean, 1. The covenant of providence; that the course of nature shall be continued to the end of time. 2. The covenant of grace; that God would be a God to Noah, and that out of his seed God would take to himself a people. God directed Noah to make an ark. This ark was like the hulk of a ship, fitted to float upon the waters. It was very large, half the size of St. Paul's cathedral, and would hold more than eighteen of the largest ships now used. God could have secured Noah without putting him to any care, or pains, or trouble; but employed him in making that which was to be the means to preserve him, for the trial of his faith and obedience. Both the providence of God, and the grace of God, own and crown the obedient and diligent. God gave Noah particular orders how to make the ark, which could not therefore but be well fitted for the purpose. God promised Noah that he and his family should be kept alive in the ark. What we do in obedience to God, we and our families are likely to have the benefit of. The piety of parents gets their children good in this life, and furthers them in the way to eternal life, if they improve it.But with thee will I establish my covenant,.... Made with Noah at this time, though not expressed, that on his making an ark, as God directed him, and going into it at his command, he would preserve him while building it from the rage of wicked men, and save him in it and his family, when the flood should come; and that they should come safe out of it, and repeople the world, which should be no more destroyed by one; for this covenant respects that later mentioned, Genesis 9:11 so Aben Ezra; or the promise of the Messiah, which should spring from him, for the fulfilment of which Noah and his family were spared; and this in every article God would confirm, of which he might be assured from his power, veracity, and faithfulness, and other perfections of his:

and thou shalt come into the ark; when the covenant would begin more clearly to be established, and more plainly to be fulfilling; Noah on the one hand being obedient to the divine will, having built an ark, and entering into it; and on the other, God giving him leave, and an order to enter into it, and shutting him up in it to preserve him:

thou and thy sons, and thy wife, and thy sons' wives with thee; that is, Noah and his wife, and his sons and their wives, in all eight persons; and eight only, as the Apostle Peter observes, 1 Peter 3:20 by this it appears that Noah's three sons were married before the flood, but as yet had no children. Jarchi concludes, from the mode of expression used, that the men and women were to be separate; that they entered the ark in this manner, and continued so, the use of the marriage bed being forbidden them while in the ark.