Galatians 3:15-18 Brethren, I speak after the manner of men; Though it be but a man’s covenant, yet if it be confirmed, no man disannulled, or added thereto. Now to Abraham and his seed were the promises made. He said not, And to seeds, as of many; but as of one, And to thy seed, which is Christ. And this I say, that the covenant, that was confirmed before of God in Christ, the law, which was four hundred and thirty years after, cannot disannul, that it should make the promise of none effect. For if the inheritance be of the law, it is no more of promise: but God gave it to Abraham by promise.
‘I speak after the manner of men; Though it be by a man’s covenant, yet if it be confirmed, no man disannulled, or added thereto.’ I [Paul] speak of civil transactions or contracts. If one is signed, sealed, witnessed, and duly recorded it stands under the protection of the civil law, and nothing can be legally added to or taken from it. So, it is with the Abrahamic covenant and promises, made 430 years before the law. The law of Moses cannot disannul them or make them of no effect. Inheritance is not of the law, but the promise of the Abrahamic covenant (3:15-18).
‘And to thy seed, which is Christ.’ This is the 4th and last Old Testament prophecy fulfilled in Galatians (3:16; Gen. 3:15; 21:12).
‘In Christ’ – The phrase “in Christ” is best understood as “because of Christ.” The Greek word eis is used in the sense of for, because of, or on account of.
‘Four hundred and thirty years after, cannot disannul.’ The whole sojourning of the children of Israel was from the seventy-fifth year of Abraham’s life when he entered Canaan to this day of the exodus. It took place in Mesopotamia, Syria, Canaan, Philistia, and Egypt. The sojourn in Egypt was only 215 years – half of the 430 of the whole period. This is the whole length of the Dispensation of Promise – from Abraham to the exodus.