Malbim: Moshe passed his tradition over to Yehoshua (Avos 1:1). Also, even though had Moshe [entered the land and] conquered, it would have been more miraculous, Yehoshua did not deviate regarding the conquest and division.

Malbim citing Midrash Rabah ¹ : Even what Moshe did not explicitly command him, Yehoshua himself understood what Hashem commanded Moshe.