"To the conductor, a wise psalm of the sons of Korah. God, we have heard with our ears. This is what the scripture says (Isaiah 63:12), 'He led them with the right hand of Moses, etc.' From here we learn that when the Israelites left Egypt, they did not have any deeds that would redeem them, and it was not because of their ancestors that the sea was split, but rather to make a name for God. Similarly, it says (Ibid. 14), 'As the cattle go down into the valley.'
And when they were redeemed from Egypt, Moses told them that they were not redeemed because of their own deeds, but rather so that they could tell their children and give glory to God among the nations. As it says (Psalm 96:1), 'Sing unto the Lord a new song.' (Ibid. 3), 'Declare His glory among the nations.' And the sons of Korah said to our ancestors, 'Tell us,' but they themselves also recount how they left Egypt.
And what is the glory of the Holy One, blessed be He, that His children recount His glory among the nations? It is that they prophesied about the generations. The sons of Korah said to our ancestors, 'You did it, not us, what benefit do we have in what you did for our ancestors?' And when do we benefit?
When you do a sign with me for good (Psalm 86:17), 'Do a sign with me for good.' The patriarchs worked a great deed in the days of Abraham, as it says (Genesis 15:15), 'And he divided himself against them by night.' Similarly, in the wilderness, the children did a deed for themselves and for their own desire, not for us. And it says (Psalm 47:3), 'God has chosen for us our inheritance.' "