Revelation 19:10 KJV
 And I fell at his feet to worship him. And he said unto me, See thou do it not: I am thy fellowservant, and of thy brethren that have the testimony of Jesus: worship God: for the testimony of Jesus is the spirit of prophecy.
The impulse to worship the messenger who had unfolded such visions was not unnatural: the immediate checking of it here and in Revelation 22:8-9, on the part of the angel, supplies an indirect evidence of the genuineness of the whole book, and gives it a moral tone immeasurably superior to the vision-books of pretended revelations.
And he saith to me, See (or, take heed) not (i.e., to do it); I am a fellow-servant of thee and of thy brethren who have the testimony of Jesus: worship God; for the testimony of Jesus is the spirit of prophecy. One bond of service unites angels and men: to be servants of God is the highest title they can attain; worship is for God alone.
The words “worship God” are most emphatic: “to God give thy worship, and not to me, who am but thy fellow-servant.” The angel is his fellow-servant, and at that time he was emphatically so, as he and the Apostle were engaged in one common work—“the testimony of Jesus.”
The Apostle’s work in the world was the testimony of Jesus (Revelation 1:2; Revelation 1:9), and the Spirit of prophecy which moved (2Peter 1:21) the angel was likewise the testimony of Jesus. One work and one worship belong to both. He whom Apostles worshipped unrebuked (Matthew 28:9; Matthew 28:17) was the one whom all the angels of God were bidden to worship (Psalm 97:7; Hebrews 1:6). It is wonderful, with this emphatic witness to our Lord Jesus Christ, any should have undervalued this book of Revelation, as one which failed to honour Him.
- Ellicott's Commentary for English Readers (Public Domain)
“I need to worship because without it I can forget that I have a big God beside me and live in fear. I need to worship because without it I can forget his calling and begin to live in a spirit of self-preoccupation. I need to worship because without it I lose a sense of wonder and gratitude and plod through life with blinders on. I need worship because my natural tendency is toward self-reliance and stubborn independence.”—John Ortberg
Angel voices breathing ever, Songs of praise to God on high, Thro’ the gates of light and glory, Call us now from yonder sky.
Come and worship, come and worship, Worship Christ our Lord and king; Come and worship, come and worship, Worship Christ our Lord and king.
O’er the lovely realm of nature By her sparkling fountains clear, Thro’ the forest and the valley, Still the earnest call we hear.
When the morning in its beauty Wakes the earth from sleep profound, In the music of the song bird We can hear the grateful sound.
In the whisper of the twilight, When the zephyrs murmur low, In the sighing of the leaflet, We can hear where’er we go.
Come and worship our creator, Him whose mercy we adore; Come and worship our Redeemer, Sing and praise forevermore.
Words:Fanny Crosby, in The Epworth Hymnal (New York: Hunt & Eaton, 1885).