strange language;

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 an hard language, but to the house of Israel; Not to many people of a strange speech and of an hard language, whose words thou canst not understand. Surely, had I sent thee to them, they would have hearkened 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 impudent and hardhearted. Ezekiel 3:4-7 King James Bible