Revelation 10:8

And the voice which I heard from heaven spake unto me again, and said, Go and take the little book which is open in the hand of the angel which standeth upon the sea and upon the earth.

Cross-reference

Revelation 10:5 depicts the angel raising his hand to heaven — the same angel who now holds the scroll here.

Revelation 10:2 describes the angel holding the open scroll — this verse commands John to take that same scroll.

Revelation 5:1 shows a sealed scroll in God's hand — this open scroll in the angel's hand is likely the same, now unsealed.

Ezekiel 2:9 shows a hand holding a scroll given to the prophet — directly paralleling the open scroll in the angel's hand here.