Rashi on Numbers 27:19/רש"י על במדבר כ״ז:י״ט

1וצויתה אתו AND GIVE HIM A CHARGE concerning Israel; say to him, “Know that they are troublesome, that they are refractory — accept your office having in mind that you will have to take upon yourself all this (cf. Sifrei Bamidbar 92 on 11:16).