'Subject' in the Bible

So we also, when spiritually we were children, were subject to the world's rudimentary notions, and were enslaved.

But, when the time was fully come, God sent forth His Son, born of a woman, born subject to Law,

in order to purchase the freedom of all who were subject to Law, so that we might receive recognition as sons.

Tell me--you who want to continue to be subject to Law--will you not listen to the Law?

But if the Spirit is leading you, you are not subject to Law.