Moses
Deuteronomy 1:38BSB·traditional attribution

Joshua son of Nun, who stands before you, will enter it. Encourage him, for he will enable Israel to inherit the land.

Matthew Henry Presbyterian @wholebiblehenry

Moses here makes a large rehearsal of the fatal turn which was given to their affairs by their own sins, and God's wrath, when, from the very borders of Canaan, the honour of conquering it, and the pleasure of possessing it, the whole generation was hurried back into the wilderness, and their carcases fell there. It was a memorable story; we read it Num.

Commenting on Deuteronomy 1:19-46

John Gill Reformed Baptist @doctorgill

But Joshua, the son of Nun, which standeth before thee,.... His servant and minister, which this phrase is expressive of: he shall go in thither: into the good land, instead of Moses, and as his successor, and who was to go before the children of Israel, and introduce them into it, as a type of Christ, who brings many sons to glory: encourage him; with...

Geneva Bible Notes Reformed @genevanotes

[But] Joshua the son of Nun, which standeth before thee, he shall go in thither: encourage him: for he shall cause Israel to inherit it. (t) Who minister to you.