Ezekiel 3:4-8

And he said unto me, Son of man, go, get thee unto the house of Israel, and speak with my words unto them. For thou art not sent to a people of a strange speech and of a hard language, but to the house of Israel; not to many peoples of a strange speech and of a hard language, whose words thou canst not understand. Surely, if I sent thee to them, they would hearken unto thee. But the house of Israel will not hearken unto thee; for they will not hearken unto me: for all the house of Israel are of a hard forehead and of a stiff heart. Behold, I have made thy face hard against their faces, and thy forehead hard against their foreheads.