Under the new covenant in Jeremiah 31:34, what does God say He will remember no more?

Answer: Their sins

All will know the LORD, from the least to the greatest: "For I will forgive their iniquities and will remember their sins no more."

“No longer will each man teach his neighbor or his brother, saying, ‘Know the LORD,’ because they will all know Me, from the least of them to the greatest, declares the LORD. For I will forgive their iniquities and will remember their sins no more.””— Jeremiah 31:34 (BSB)