What did the Old Testament covenants say about when God would turn to the Gentiles?

Les explains that this was part and parcel of the Old Testament covenants: the day would come when Israel had completed the promises, and then God would turn to the Gentile world. He points to Isaiah 49:6, where God says He will give His servant as a light to the Gentiles and salvation to the end of the earth. Jacob was the nation as a whole, while Israel was the believing remnant. Israel was to have had the opportunity, and to a certain extent did because every word of this book was written by Jews, but God had even more for the nation. They rejected it in unbelief. God’s idea was to go to the Gentile world through this covenant people, and from the beginning He knew the day would come when He would go to the whole Gentile world with His salvation. When Israel constantly rejected it, He had to send the nation into dispersion, taking away their temple and land.