Galatians 3:17

this I say--"this is what I mean," by what I said in Gal 3:15. continued . . . of God--"ratified by God" (Gal 3:15). in Christ--rather, "unto Christ" (compare Gal 3:16). However, Vulgate and the old Italian versions translate as English Version. But the oldest manuscripts omit the words altogether. the law which was--Greek, "which came into existence four hundred thirty years after" (Exo 12:40-41). He does not, as in the case of "the covenant," add "enacted by God" (Joh 1:17). The dispensation of "the promise" began with the call of Abraham from Ur into Canaan, and ended on the last night of his grandson Jacob's sojourn in Canaan, the land of promise. The dispensation of the law, which engenders bondage, was beginning to draw on from the time of his entrance into Egypt, the land of bondage. It was to Christ in him, as in his grandfather Abraham, and his father Isaac, not to him or them as persons, the promise was spoken. On the day following the last repetition of the promise orally (Gen 46:1-6), at Beer-sheba, Israel passed into Egypt. It is from the end, not from the beginning of the dispensation of promise, that the interval of four hundred thirty years between it and the law is to be counted. At Beer-sheba, after the covenant with Abimelech, Abraham called on the everlasting God, and the well was confirmed to him and his seed as an everlasting possession. Here God appeared to Isaac.

— Jamieson-Fausset-Brown Commentary (public domain)