Why would Israel and Judah ask the way to Zion?
This is not the literal Zion, the state of Israel, because they will all know where it is geographically. Rather, they will ask the Main Harvest Christians that are left behind after the First Fruits rapture about their savior, Jesus Christ. These Christians will witness to and teach those 144,000 Israelites the ways of Jesus. The Main Harvest Christians will show them the ways of the scripture and in particular New Testament faith, love and works. At mid Tribulation, the Main Harvest Christians will be taken to Heaven to be with God. The 144,000 faithful Jews will then be preaching the Gospel of the Kingdom to the rest of the world. They will be absolutely sinless and faithful to God because they will receive their resurrection bodies at mid-Tribulation because Jesus will personally give them this wonderful gift. They will be protected by God against all evil in the world and specifically against the persecution by Antichrist.