פירוש על דברים 1:41

ותהינו — This is an expression derived from the word הננו in (Numbers 14:40) "Here we are (הננו) and we will go up to the place”. This is the expression which you uttered — the expression הן, "yes”. The word, therefore, means as much as: you expressed your readiness to go up into the mountain.

ANACHNU’ (WE) ‘NA’ALEH’ (WE WILL GO UP) AND FIGHT. The purport of the word ‘anachnu’ (we) [when it is already included in the word na’aleh which means “we will go up”] is that “we ourselves” will go up and we will fight, and we will not leave the matter to our children after us, as you [Moses] have said.

ותהינו, meaning הננו, “we are ready, prepared;” the people at that point were willing to ascend. (Numbers 14,40)