He is, i.e. signifies, as that word is commonly used in the Hebrew tongue, as Genesis 41:26,27, and every where. The prophet that teacheth lies; whose destruction he mentions, not as if it were a punishment to them to be deprived of such persons, but partly to show the extent of the calamity, that it should reach all sorts of persons; and partly to beat down their vain presumptions of peace and prosperity, by showing that those false prophets, which had fed their vain hopes, should perish, and all their false prophecies of peace with them. He is the tail; these I mean by the tail, as being in truth the basest part of the whole body of the people.
Related Commentaries of Isaiah 9:15
Isaiah 9:15
15 The ancient and honourable, he is the head; and the prophet that teacheth lies, he is the tail.