John Gill Commentary Deuteronomy 1:43

"So I spake unto you, and ye hearkened not; but ye rebelled against the commandment of Jehovah, and were presumptuous, and went up into the hill-country." — Deuteronomy 1:43 (ASV)

So I spoke to you The words, the orders he had received from the Lord to deliver to them:

and you would not hear ; so as to obey them, and act according to them:

but rebelled against the commandment of the Lord : as before, by not going up when he would have had them gone, and now by attempting it when he forbade them:

and went presumptuously up into the hill ; that is, of themselves, in their own strength, disregarding the commandment of God, and what they were threatened with; this they endeavoured to do, for they were not able to effect it; the Amorites, perceiving them to make up the hill, came pouring down upon them in great numbers, and stopped them, and obliged them to retreat; see (Numbers 14:45) .