Will God ever cast aside Israel?

Les teaches that the idea God is through with the Jew, or that He cast them off when they crucified their Messiah, is wrong. Scripture is adamant that He will come back and fulfill the covenant promises made to Abraham, Isaac, and Jacob. In Jeremiah 31, God compares His commitment to Israel to the fixed ordinances of the sun, moon, stars, and sea. Only if those laws of nature depart, or if heaven above can be measured and the foundations of the earth searched out beneath, would He cast off the seed of Israel for all they have done. Since that cannot be done, He will never cast aside Israel. Les explains that when Israel rejected Messiah, God raised up Saul of Tarsus, known as Paul, and sent him primarily to the Gentiles, just as earlier He went primarily to the Jew. Individual Jews can certainly be saved in the age of grace, but the church is not to be mixed with Israel in the tribulation, because the tribulation is primarily God dealing with the nation of Israel.