John Wesley on Genesis 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, &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.