Isaiah 33:19 Never again will you see the cruel people, a people whose tongue has no sense for you; whose language is strange to you. (See NAS)
Ezekiel 3:5 For thou art not sent to a people of an unintelligible speech and of a slow tongue, but to the house of Israel; (JPS NAS)
Ezekiel 3:6 not to many peoples of an unintelligible speech and of a slow tongue, whose words thou canst not understand. Surely, if I sent thee to them, they would hearken unto thee. (JPS NAS)