Another matter, “hear, Israel: you are crossing the Jordan today” – this is what the verse said: “God, we have heard with our ears, our fathers have told us of the deeds You did in their days” (Psalms 44:2). What is “with our ears”? Rabbi Tanḥuma said: We heard what You said to Moses at the bush. You said to Moses at the bush: ‘It is revealed and foreseen before Me that they are destined to anger Me; nevertheless, I will redeem them.’
From where is it derived that the Holy One blessed be He said this to him? As it is written: “I have seen the affliction of My people that is in Egypt…[as I know its pain]” (Exodus 3:7). What is “as I know its pain”? The Holy One blessed be He said to Moses: ‘I know what pain they are destined to cause [Me by saying, of the golden calf]: “This is your god, Israel” (Exodus 32:4).
Nevertheless, “I have descended to rescue them from the land of Egypt”’ (Exodus 3:8). These are the conditions that You stipulated with Moses. Just as You stipulated with him, so “we have heard with our ears.” What is “our fathers have told us”?
This is Moses, who is called father of all the prophets. “You, with Your hand, drove out nations, and planted them” (Psalms 44:3). [Moses] said to them: ‘From what He did to the two Emorite kings, who were great, you know what He will do to the thirty-one kings when you cross the Jordan.’ That is, “hear, Israel: you are crossing the Jordan today.”