John Trapp on Isaiah 28:13

Ver. 13. But the word of God was unto them precept upon precept, &c.] i. e. a deriſion, as ver. 10. therefore henceforth hearing they ſhall hear and not underſtand: Sic Sanniones Deus punit.

That they may go and fall backward] ut vadant & cadant retrorſum, tanquam turpiter ab hoſte ſuperati & reſuperati, laid flat on their backs, brought to remedileſs ruin. This came of their obſtinacy; though not intentionally, yet eventually.