Context Summary
Revelation 11:1–2 follows the mighty angel telling John he would prophesy again about many peoples and nations and languages and kings (Revelation 10:11). Here, John receives a measuring rod and the command to measure the temple, the altar, and the worshipers. However, he was told not to measure the outer court. It would be overrun by the Gentile nations for three and a half years. The reference to the temple aligns with the following passages of Scripture: Haggai 2:7–9; Zechariah 1:16; Malachi 3:1; Matthew 23:38–39; 24:15; and 2 Thessalonians 2:4. While the Gentiles command the temple, two divinely authorized witnesses will prophesy, as explained in the following verses.

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What does Revelation 11:1 mean? | BibleRef.com

Revelation 11:1

A reed like a rod was given to me. Someone said, “Rise, and measure God’s temple, and the altar, and those who worship in it.