isaiah 28:9 Whom shall he teach knowledge? and whom shall he make to understand doctrine? them that are weaned from the milk, and drawn from the breasts. - Free Bible Online

      9, 10. Here the drunkards are introduced as scoffingly commenting on Isaiah's warnings: "Whom will he (does Isaiah presume to) teach knowledge? And whom will He make to understand instruction? Is it those (that is, does he take us to be) just weaned, &c.? For (he is constantly repeating, as if to little children) precept upon precept," &c.
      line--a rule or law. [MAURER]. The repetition of sounds in Hebrew tzav latzav, tzav latzav, qav laqav, qav laquav, expresses the scorn of the imitators of Isaiah's speaking; he spoke stammering (Isa 28:11). God's mode of teaching offends by its simplicity the pride of sinners (2Ki 5:11, 12; 1Co 1:23). Stammerers as they were by drunkenness, and children in knowledge of God, they needed to be spoken to in the language of children, and "with stammering lips" (compare Mt 13:13). A just and merciful retribution.

JFB.