Galatians 3:17

Now this I say: a covenant confirmed beforehand by God, the Law, which came four hundred and thirty years after, doth not disannul, so as to make the promise of none effect.

This was Paul's repetition for the sake of emphasis of the argument already delivered above.

Four hundred and thirty years ... For comment on the variation in this figure from that given by Stephen in Acts 7:6, see my Commentary on Acts 7:5-8. Paul used the figure also found in the LXX, and Stephen used a round number.