Because finding fault with them, He says: "Behold, the days are coming, says the Lord, when I will make a new covenant with the house of Israel and with the house of Judah--
not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt; because they did not continue in My covenant, and I disregarded them, says the Lord.
For this is the covenant that I will make with the house of Israel after those days, says the Lord: I will put My laws in their mind and write them on their hearts; and I will be their God, and they shall be My people.
None of them shall teach his neighbor, and none his brother, saying, 'Know the Lord,' for all shall know Me, from the least of them to the greatest of them.
For I will be merciful to their unrighteousness, and their sins and their lawless deeds I will remember no more."
References for Hebrews 8:12