John Chrysostom
God also establishes the timing for the liberation from bondage. He mentions a duration of 'four hundred years' and subsequently adds, 'in the fourth generation they shall return here.' Some may find it confusing how it is stated they will serve 'four hundred years' when they did not spend even half of that time in Egypt. However, it is clarified that they would not be enslaved 'in Egypt' for four hundred years, but rather 'in a land not their own.' This implies that the years spent in Egypt include the lifetime of their forefather, who was instructed to leave Haran. The Scriptures indicate he was seventy-five years old at that time. If one calculates the time from then until the Exodus, they will indeed arrive at the full span of four hundred years.
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Moreover, it can be said that the Lord, in His mercy and awareness of our frailties, acted to relieve them as soon as He perceived their exhaustion from labor and the severe oppression inflicted by the Egyptians. He rendered judgment at that moment and guided them toward liberation. This is characteristic of His nature: while He designs our salvation and warns of consequences, He rescinds His judgment if we turn back to Him. Conversely, though He assures us of blessings, if we fail to do our part, He does not fulfill His promises lest our situation worsen.
All of this is evident if one reads the Holy Scriptures earnestly. 'In the fourth generation they shall return here: for the measure of the iniquities of the Amorites is not yet filled.' Here, the timing is indicated not just for the deliverance of Abraham's descendants but also for the condemnation and expulsion of the Amorites due to their extensive sins. Thus, the restoration of some and the destruction of others will occur at the appointed time. The Lord states that the 'measure of their iniquities' has not yet reached its fullness, meaning their offenses have not yet warranted severe punishment. In His mercy, the Lord refrains from exacting punishments beyond our sins and often sends lesser ones. Therefore, He displays remarkable patience toward the Amorites, giving them opportunity to recognize their culpability before facing the consequences of their actions.
Consider how the Lord meticulously communicated His plans to the forefather, aiming to fortify his faith in every respect and assure him that all that had been foretold concerning him and his descendants would indeed come to pass.