What does God promise to make with Israel and Judah in Jeremiah 31:31?

Answer: A new covenant

"Behold, the days are coming, declares the LORD, when I will make a new covenant with the house of Israel and with the house of Judah."

“Behold, the days are coming, declares the LORD, when I will make a new covenant with the house of Israel and with the house of Judah.”— Jeremiah 31:31 (BSB)