Sojourn in this land, and I will be with thee, and will bless thee; for unto thee, and unto thy seed, I will give all these countries, and I will perform the oath which I sware unto Abraham thy father… – Genesis 26:3

God said to Isaac, “I will be with thee, and will bless thee…I will perform the oath which I sware unto Abraham thy father.” And in the twenty-fourth verse of the chapter, where the promise is renewed, it is still on the ground of the covenant: “I am with thee, and I will bless thee, and multiply thy seed for my servant Abraham’s sake.” Now, do you know anything of the covenant relationship between God and His people? The bulk of Christians nowadays are wholly ignorant on this subject…I love the promises of God because they are covenant promises. God has engaged to keep His word with His people in the person of His dear Son. He has bound Himself, by covenant with Christ, and will not, cannot, go back from His word; and Christ has fulfilled the conditions of the covenant, and He who hath “brought again from the dead our Lord Jesus, that great Shepherd of the sheep, through the blood of the everlasting covenant,” will certainly, “make you perfect to do His will, working in you that which is well-pleasing in His sight, through Jesus Christ.” The promise is a double promise when it is confirmed in Jesus. Though we are poor and worthless creatures, yet can we say with David, “Although my house be not so with God, yet He hath made with me an everlasting covenant, ordered in all things, and sure.” Twice God says by Isaiah, “I have given Him for a covenant to the people” thrice happy are they who receive what God hath given, and who, in Christ, enter into that blessed bond. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2238.cfm