What kind of salvation did Israel need in addition to physical deliverance?

Israel needed a spiritual salvation, not only deliverance from physical enemies and a physical kingdom with peace and prosperity. Scripture describes it as knowledge of salvation given to His people by the remission of their sins through the tender mercy of God.

Les explains that the Old Testament contains two parallel thoughts: the king and the kingdom, and a suffering Savior. Every Jew wanted the king and the kingdom, but they did not want to deal with the Savior, and that was their problem. They were to be saved from their physical enemies, have a physical kingdom, and enjoy physical peace and prosperity, but they also had to have a spiritual salvation. This is described as giving knowledge of salvation unto His people by the remission of their sins through the tender mercy of our God. The next step was to give light to the Gentiles who sit in darkness and in the shadow of death, as Israel was to carry the light of the world to the Gentiles.

Luke 1:77

To give knowledge of salvation unto his people by the remission of their sins,

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What two kinds of salvation did God plan for Israel?

God's plan for Israel included a physical salvation—deliverance from their physical enemies, a physical kingdom, peace, and prosperity—and a spiritual salvation—the remission of their sins through God's tender mercy. Both were necessary: the nation was to experience political and physical fulfillment alongside the spiritual salvation that gave knowledge of salvation to His people.

What were the physical and spiritual aspects of Israel's promised salvation?

Israel's promised salvation included physical deliverance from enemies, a physical kingdom, and physical peace and prosperity, but it also required spiritual salvation, which is remission of sins through the tender mercy of God. Once fulfilled spiritually, politically, and physically, Israel was to carry light to Gentiles sitting in darkness and the shadow of death.