I will east thee; rather, I song thee away. Possibly, as Hitzig suggests, there is an allusion to the preceding verse, in which the same verb occurs. Thou hast taught rebellion; literally, thou hast spoken turning aside. To "speak turning aside (or, 'rebellion')" is a phrase of Deuteronomy (Deuteronomy 13:6), where it is used, as here, of opposition, not to Jehovah, but to revealed truth.
HOMILETICS