And the LORD will give them over to you, and you shall do to them according to the whole commandment that I have commanded you.
Moses could not cross Jordan himself, yet he would not abandon Israel without a word of encouragement. Though Joshua would lead them in battle, they would miss Moses interceding for them on the hill. But God had set His limit: his time to serve was finished, and he acquiesced, for what man should desire to live longer than God has work for him to do?
AI summary
Commenting on Deuteronomy 31:1-8
Be strong and of a good courage,.... The Septuagint version is,"play the men, and be strong;''be strong in the Lord, and in the power of his might, trusting and relying on him that goes before you; and so take heart, and be of good courage, and act the manly part; the apostle seems to refer to this passage, Co1 16:13, fear not, nor be afraid...
And the LORD shall give them up before your face, that ye may do unto them according unto all the commandments which I have commanded you. (b) Into your hands.