On the last day of Moses' life...
(9) So Moses wrote down this law and gave it to the Levitical priests, who carried the ark of the covenant of the Lord, and to all the elders of Israel....
(14) The Lord said to Moses, “Now the day of your death is near. Call Joshua and present yourselves at the tent of meeting, where I will put him in charge [of the Israelites].” So Moses and Joshua came and presented themselves at the [desert Temple]. (15) Then the Lord appeared at the tent in a pillar of cloud, and the cloud stood over the entrance to the tent. (16) And the Lord said to Moses: “You are going to rest with your ancestors [to die and be buried], and these people will soon sell out to the foreign gods of the land they are entering. They will forsake me and break the covenant I made with them....
(19) “Now write down this song and teach it to the Israelites and have them sing it, so that it may be a witness for me against them. (20) When I have brought them into the land flowing with milk and honey, the land I promised on oath to their ancestors, and when they eat their fill and thrive, they will turn to other gods and worship them, rejecting me and breaking my covenant. (21) And when many disasters and calamities befall them, this song will testify against them, because it will not be forgotten by their descendants. I know what they are disposed to do, even before I bring them into the land I promised them on oath.”
(22) So Moses wrote down this song that day and taught it to the Israelites. (23) The Lord gave this command to Joshua son of Nun: “Be strong and courageous, for you will bring the Israelites into the land I promised them on oath, and I myself will be with you.”