But even Paul did not leave it there with the Gentile churches. He warned the Galations against adultery, fornication, uncleanness, lasciviousness, idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, envy, murder, drunkenness, revelling which are forbidden in the Old Testament. He rebuked the Corinthians because a man had taken his father's wife, a command straight from Lev 18:8 and Deut 22:30. The admonitions in his letters, like the teachings of Christ, are rooted and grounded in Old Testament moral law.
One brother wrote to me after reading my article on Hebrews and said that the moral and judicial aspects of the law were also perfectly fulfilled and done away with in Christ. 'We needed Christ both to pay the price for our sins and to fulfil the requirements of the moral law for us,' he wrote.
Now in one sense this sentence is true. Christ's authority to bear my sins and justify me before a righteous and holy God lies in the fact that He was without sin. This is a point that Muslims fail to understand when they object to Jesus taking our sin upon Him on the grounds that 'no-one can bear another's burden'. This is an important objection to Christian theology for Islam; it is repeated in the Koran five times. For example:
'And no bearer of burdens shall bear another's burden; and if one heavily laden calls another to (bear) his load, nothing of it will be laden even though he be near of kin.' (Koran 35:18)
But it is precisely because Jesus Christ had no burden of sin Himself that He can bear my burden of sin and that I can indeed put all my trust, or as Galatians 3:23 puts it, my faith, in Christ and call to Him to bear my burden. Peter in Acts 15:11 says our salvation, or justification before God, is of His grace, not of our own doing.