But with thee will I {m} establish my covenant; and thou shalt come into the ark, thou, and thy sons, and thy wife, and thy sons' wives with thee.

(m) So that in this great undertaking and mocking of the whole world, you may be confirmed so your faith does not fail.

Wesley's Notes

6:18 But with thee will I establish my covenant - [1.] The covenant of Providence, that the course of nature shall be continued to the end of time, not withstanding the interruption which the flood would give to it: this promise was immediately made to Noah and his sons, Ge 9:8, and c. they were as trustees for all this part of the creation, and a great honour was thereby put upon him and his. God would be to him a God, and that out of his seed God would take to himself a people.

Jamieson-Fausset-Brown Bible Commentary

18. But with thee will I establish my covenant-a special promise of deliverance, called a covenant, to convince him of the confidence to be reposed in it. The substance and terms of this covenant are related at Ge 6:19-21.

Matthew Henry's Concise Commentary

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.