During what period of the Bible timeline was God dealing only with the Jews?
God dealt almost exclusively with the Jews from Genesis chapter 12 until the Book of Acts. This period begins with the Abrahamic Covenant and centers on the nation of Israel, including the giving of the Law and the Temple, with only very few exceptions.
Les explains that from Genesis chapter 12 through the Book of Acts, God was dealing with Jew only, with very few exceptions. He connects this to the Abrahamic Covenant and the nation of Israel, to whom God gave the Law and the Temple. Les notes God's sovereign plan was to use Israel to bring the knowledge of the God of Abraham, Isaac, and Jacob back into the ungodly river of humanity, but Israel did not believe it.
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Was God only dealing with Jews from Genesis 12 until Acts?
From Genesis 12, the call of Abram, until well into Acts, God's dealings were predominantly with Jews only.