let us find out through the Bible if God the Father, Jehovah and God the Holy Spirit are one entity.
These are the things God has revealed to us by his Spirit. The Spirit searches all things, even the deep things of God. For who knows a person’s thoughts except their own spirit within them? In the same way no one knows the thoughts of God except the Spirit of God.1 Corinthians 2:10-11
“For who knows a person’s thoughts except their own spirit within them?” Can we know each other’s thoughts? We cannot since we are of different entities and different spirits. This also applies to God—the thoughts of God the Father, Jehovah can only be understood by His very own Spirit. However it is written that God the Holy Spirit is able to search even the deep things of God the Father, Jehovah. How is it possible? It is because They are one entity—God the Holy Spirit is the very spirit of God the Father, Jehovah.
The Scriptures as inspired by the Holy Spirit
All scripture is given by inspiration of God…2 Timothy 3:16 [ NKJ ]
Above all, you must understand that no prophecy of Scripture came about by the prophet’s own interpretation of things.For prophecy never had its origin in the human will, but prophets, though human, spoke from God as they were carried along by the Holy Spirit.2 Peter 1:20-21
It is written in Timothy that all Scriptures are given by the inspiration of God, and the Apostle Peter mentions that the Scriptures were written by those who were carried along by the Holy Spirit.
Since God is holy (Leviticus 11:44), the Spirit of God is naturally the Holy Spirit. Therefore, God the Father and God the Holy Spirit are one and the same God.