For a brother to have something against you means that there is a person whom you have wronged/who thinks that you have wronged them. 1 Jesus wants those who follow him to take the initiative in reaching out to the person, irrespective of whether they are guilty or innocent. 2 Kingdom citizens have been forgiven and they must be quick to forgive and seek the forgiveness of others (see Matthew 5:7).
23 So if you are offering your gift at the altar and there remember that your brother has something against you,