Middle Wall

Concise Bible Dictionary:

The law which separated the Jews from the Gentiles is called a “middle wall.” In the cross this was removed for believers, and both were made one, no longer remaining Jews or Gentiles. Christ formed the two into one new man, and thus made peace between them (Eph. 2:14-1514For he is our peace, who hath made both one, and hath broken down the middle wall of partition between us; 15Having abolished in his flesh the enmity, even the law of commandments contained in ordinances; for to make in himself of twain one new man, so making peace; (Ephesians 2:14‑15)).