Deuteronomy 17:16

17:16 Moreover, he must not accumulate horses for himself or allow the people to return to Egypt to do so, for the Lord has said you must never again return that way.

Deuteronomy 31:2

31:2 He said to them, “Today I am a hundred and twenty years old. I am no longer able to get about, and the Lord has said to me, ‘You will not cross the Jordan.’