If therefore thou art offering thy gift at the altar, and there rememberest that thy brother hath aught against thee,

So if you are offering your gift at the altar and there remember that your brother has something against you,

`If, therefore, thou mayest bring thy gift to the altar, and there mayest remember that thy brother hath anything against thee,

If therefore thou shouldest offer thy gift at the altar, and there shouldest remember that thy brother has something against thee,