Revelation 10:9, "Give me the little scroll... Take it, and eat it up" - the same instruction to eat a scroll before prophesying.
He said to me, “Son of man, eat what you find. Eat this scroll, and go, speak to the house of Israel.”
I went to the angel, telling him to give me the little book. He said to me, “Take it, and eat it up. It will make your stomach bitter, but in your mouth it will be as sweet as honey.”
Ezekiel is told upfront that Israel will refuse to listen - unlike a foreign nation, whose strange language alone would make communication hard, Israel's resistance is willful, not linguistic.