Revelation 20:1

And I saw an angel come down from heaven, having the key of the bottomless pit and a great chain in his hand.
— Revelation 20:1, King James Version

In other translations

World English Bible (WEB)

I saw an angel coming down out of heaven, having the key of the abyss and a great chain in his hand.

American Standard Version (ASV)

And I saw an angel coming down out of heaven, having the key of the abyss and a great chain in his hand.

Young's Literal Translation (YLT)

And I saw a messenger coming down out of the heaven, having the key of the abyss, and a great chain over his hand,