"Where does the Bible call the church the "church of Christ"?"

Why does the "Church of Christ" insist that their name is scriptural when it cannot be found anywhere in the Bible? The church is referred to as the "church of God" eight (8) times in the Bible, but never is it called the "church of Christ." The verse they use is Romans 16:16, but it doesn't say "church of Christ." Where does the Bible call the church  the "church of Christ"?

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