'Back' in the Bible

Nor did I [even] go up to Jerusalem to those who were apostles before me; but I went to Arabia and stayed awhile, and afterward returned once more to Damascus.

Now, however, since you have come to know [the true] God [through personal experience], or rather to be known by God, how is it that you are turning back again to the weak and worthless elemental principles [of religions and philosophies], to which you want to be enslaved all over again?