Deuteronomy 31:1-3

So Moses went and spoke these words to all Israel. And he said to them, “I am a hundred and twenty years old today; I am no longer able to come and go, and the LORD has said to me, ‘You shall not cross this Jordan.’ It is the LORD your God who will cross ahead of you; He will destroy these nations before you, and you shall dispossess them. Joshua is the one who will cross ahead of you, just as the LORD has spoken.