God foretells that He will make governor Zerubbabel “like My signet ring.” This means that Zerubbabel would have God’s supreme authority—he could speak for God.
How could this happen? Zerubbabel couldn’t do it himself, but God sovereignly placed him in the family lines of both Joseph and Mary. This family lineage of Jesus Christ carried BOTH the covenant-fulfilling, kingly authority that traced back to Abraham AND the satan-crushing promise given to Adam’s human line.
Jesus joined these two promises through Zerubbabel the signet ring. Jesus became God’s Ultimate Signet Ring so that now every promise is “Yes” in Him. This mens every time we pray and claim promises in God’s Word, Jesus adds His stamp of authority—His “Amen!”—to our prayers (see 2 Corionthians 1:20).