The angel of the Lord said to John the apostle, "Worship God" (Rev. 22:9). That's after John fell at the angel's feet to worship. The warning reminds us to worship anyone else but God is idolatry. When the book of Revelation was written, people were commanded to worship the Emperor of the Roman Empire. Christians were persecuted, because they refused to worship him.
The book of Revelation is about worship of the true and living God. Heaven is revealed as the place of continuous worship of God (Rev. 4-5). Both angels and saints worship God Almighty. They worship bowing before Him with words such as these: "You are worthy, O Lord, to receive glory and honor and power; for You created all things, and by Your will they exist and were created" (Rev. 4:11).
"And the twenty-four elders fell down and worshiped Him who lives forever and ever" (Rev. 5:14). The elders represent all the redeemed of the Lord in heaven. They fell down in submission to the sovereign Lord God and worshiped Him. Their number twenty-four represents the twelve tribes of Israel and the twelve apostles of the Lamb. That is the redeemed of Israel and the church.
John heard the worship in heaven. That worship was words of praise and adoration to the Lord our God. He testified, "After these things I heard a loud voice of a great multitude in heaven, saying, Alleluia! Salvation and glory and honor and power belong to the Lord our God!" (Rev. 19:1). That's true worship giving glory and honor to God. His people worship Him now and forever!