Matthew 22:39

“And a second like to it is this, You shall love your neighbour as yourself.”

But Jesus then adds a second so as to ensure that love for each other is given its rightful place and not overlooked (for man can be guilty of such insensitivity that in his supposed love for God he neglects his neighbour), and that was ‘you shall love your neighbour as yourself'. This second, which is ‘like to the first', also emphasises love, and is taken from Leviticus 19:18 (compare Matthew 5:42; Matthew 19:19). It especially has in mind there complete honesty, fair judgment, non-talebearing, and avoiding all hatred, vengeance, and the bearing of grudges (compare Matthew 5:21), while at the same time allowing for the rebuking of a neighbour in love (Matthew 7:1), although always without permanent rancour (Leviticus 19:13) Thus love for God, resulting also in love for one another, are to be seen as the two central features of the Law, paralleling and lying behind the two sections of the ten commandments, the Godward and the manward.