Isaiah 28:9-10

9“Who is it he is trying to teach? To whom is he explaining his message? To children weaned from their milk, to those just taken from the breast?

10For it is: Do this, do that, a rule for this, a rule for that Hebrew / sav lasav sav lasav / kav lakav kav lakav (probably meaningless sounds mimicking the prophet’s words); also in verse 13 ; a little here, a little there.”