Rashi on Numbers 27:21/רש"י על במדבר כ״ז:כ״א

1ולפני אלעזר הכהן יעמד AND HE SHALL STAND BEFORE ELEAZAR THE PRIEST — Here you have the request that you have made: that this honour should not depart from your father’s house, for Joshua, too, will need Eleazar (Midrash Tanchuma, Pinchas 11).

2ושאל לו AND HE SHALL ASK OF HIM, whenever he finds it necessary to go forth to war (cf. Targum Jonathan on).

3על פיו AT HIS WORD [SHALL THEY GO FORTH] — at Eleazar’s.

4וכל העדה AND ALL THE CONGREGATION — the Sanhedrin (Sanhedrin 16a).