Unto whom was God obedient? There is no higher power than God so whom was He obedient too?
There is a hierarchy in the Trinity.
John 5:19; Therefore Jesus answered and was saying to them, "Truly, truly, I say to you,
the Son can do nothing of Himself, unless it is something He sees the Father doing; for whatever the Father does, these things the Son also does in like manner.
John 8:28; So Jesus said, "When you lift up the Son of Man, then you will know that I am He, and
I do nothing on My own initiative, but I speak these things as the Father taught Me.
The Father is over the Son.
John 15:26; "When the Helper comes,
whom I will send to you from the Father, that is the Spirit of truth who proceeds from the Father,
He will testify about Me,
John 16:13; "But when He, the Spirit of truth, comes, He will guide you into all the truth; for
He will not speak on His own initiative, but whatever He hears, He will speak; and He will disclose to you what is to come.
The Son is over the Spirit.