John 7:29 I know Him [the Father], because I am from Him, and He sent Me. 15:26 But when the Comforter comes, whom I will send to you from the Father, the Spirit of reality, who proceeds from the Father, He will testify concerning Me.
The Greek preposition rendered “from” in these verses and in John 6:46 has the meaning of “from with.” The Son is sent not only from the Father, but also from with the Father. In John 15:26 the Lord says that He will send the Spirit from with the Father. According to the human concept, the Spirit is sent from the Father, and the Father remains in the heavens.
However, the Spirit of reality is sent by the Son, not only from the Father, but also with the Father. The Comforter comes from the Father and with the Father. The Father is the source.
When the Spirit comes from the source, it does not mean He leaves the source, but that the source comes with Him. This Spirit, sent by the Son and coming with the Father, will testify concerning the Son. The three of the Godhead are three-in-one.
The Father, the Son, and the Spirit are not three separate Gods, but the one unique God. This is the correct understanding of the Triune God according to the pure Word of God.