The first stop in justification is the time Israel spent in Egypt.
Exodus 12:41 41 And at the end of four hundred and thirty years, on that very day, all the hosts of the Lord went out from the land of Egypt. (This scripture says because they left on Passover, they also entered on Passover 430 years to the very day.)
All english versions use the Masorectic texts which were developed around 900 AD and used by the orthodox jews to this day. But guess what, these same orthodox jews do not believe they were in Egypt for 430 years. Most count time beginning when Abraham was 75 years old at the offering of the pieces. The time in Egypt are the only scriptures concerning time in dispute!
The surprise from the Septuagint text.
And the sojourning of the children of Israel, while they sojourned in the land of Egypt and the land of Chanaan, four hundred and thirty years.
Did you notice it says Cannan and Egypt for 430 years not just in Egypt for 430 years. The Septuagint LXX text is far older than the Masorectic texts we use today. The scrolls Jesus read from!
Second stop is Abraham and the covenant between God and himself. A covenant is also a m,an's will which takes place upon his death just like when the Lord gave us a New Covenant on Passover which took place after his death.
Galations 3--5 To give a human example, brethren: no one annuls even a man’s will, or adds to it, once it has been ratified. 16 Now the promises were made to Abraham and to his offspring. It does not say, “And to offsprings,” referring to many; but, referring to one, “And to your offspring,” which is Christ. 17 This is what I mean: the law, which came four hundred and thirty years afterward, does not annul a covenant previously ratified by God, so as to make the promise void. 18 For if the inheritance is by the law, it is no longer by promise; but God gave it to Abraham by a promise.
Abraham was born in year 1948 from creation 1948
Lived 175 years (died year 21 add 175
equals 2123
Passover exodus date 2553 Equals 315 years in Egypt and 115 years in Cannan