ציטירנדיקער פּירוש אויף במדבר 27:12

וזאת הברכה אשר ברך משה, after G’d had shown him the whole Land of Israel before he died, in order that he should be able to pronounce a blessing both over the land and over the people who were going to live in it. Both Moses‘ plea to see the land by crossing the river Jordan (Deut. 3,25) אעברה נא ואראה, and G’d’s purpose in granting him this part of his prayer (Numbers 27,12) were intended for this purpose, i.e. for him to bless the people after viewing the Land of Israel would inspire him to do so. Here we have the text of this blessing.

ויעל משה, “Moses ascended;” G-d had told him to ascend Mount Nebo already in Numbers ,27,12; at that time the Mountain was called: הר העברים. Nonetheless, Moses had waited with doing this until he had blessed his people.

Moshe, My servant is dead. But if he were alive,⁴According to Rashi, this is connected to what follows: Since he is dead, you must arouse yourself and cross this Jordan. I would have wanted him [as the leader].⁵According to Metsudas Dovid, Hashem said that if Moshe was still alive, you would be unable to cross the Jordon because of the decree preventing him from crossing the Jordon. See Bamidbar 20:12; Ibid 27:12,13. Our Sages explain [that this passage is a reference] [to the three thousand laws that were forgotten] during the period of mourning for Moshe. Yehoshua then came and asked.⁶When the Bnei Yisroel realized that they had forgotten so many laws of the Torah, they came to Yehoshua and asked him to teach them the laws, but he too had forgotten many of them. He wanted Hashem to reveal those forgotten laws to him. the Holy One blessed is He, said to him: “Moshe, My servant is dead, and the Torah is called on his name, which is like telling you that it is impossible.⁷Since the Torah is referred to as תּוֹרַת משֶׁה, the Torah of Moshe, and Moshe is dead, these laws cannot be reenacted. Go and burden them with battles.”⁸God told Yehoshua to get the people occupied with conquering the land. He told him to begin preparations to cross the Jordan and this would cause them to forget about the laws that were lost to them. This refers to the battles of conquest that were required to capture the land.