Galatians 4:1-3

What I am saying is that as long as an heir is underage, he is no different from a slave, although he owns the whole estate. The heir is subject to guardians and trustees until the time set by his father. So also, when we were underage, we were in slavery under the elemental spiritual forces of the world.

when we were underage, we were in slavery 
Galatians 4:8-9  Formerly, when you did not know God, you were slaves to those who by nature are not gods. But now that you know God--or rather are known by God--how is it that you are turning back to those weak and miserable forces? Do you wish to be enslaved by them all over again? 
Galatians 4:24-25  These things are being taken figuratively: The women represent two covenants. One covenant is from Mount Sinai and bears children who are to be slaves: This is Hagar. Now Hagar stands for Mount Sinai in Arabia and corresponds to the present city of Jerusalem, because she is in slavery with her children.
Galatians 2:4  This matter arose because some false believers had infiltrated our ranks to spy on the freedom we have in Christ Jesus and to make us slaves.

under the elemental spiritual forces of the world 
Colossians 2:8  See to it that no one takes you captive through hollow and deceptive philosophy, which depends on human tradition and the elemental spiritual forces of this world rather than on Christ.
Colossians 2:20-21  Since you died with Christ to the elemental spiritual forces of this world, why, as though you still belonged to the world do you submit to its rules: "Do not handle! Do not taste! Do not touch!"?

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide. 
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