The attributes of the 144,000 in Revelation 7 and 14 are found in prophecies of Israel, indicating that a humbled remnant of Israel will turn to God.
Each depiction of the Sixth Seal also shows God's involvement with physical Israelites. John's vision precedes a glimpse of 144,000 of the tribes of Israel.
Christ empowers His disciples to preach and heal. He is saying there will be an incomplete work of healing and preaching in the run-up to His return.
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