Question: Whose Spirit is the Holy Spirit?
“Is the Holy Spirit the Father’s Spirit or the Son’s Spirit or both at the same time or different Spirits at different times (in other words, is it sometimes Christ’s Spirit and sometimes the Father’s Spirit)?”
Strictly speaking, the Holy Spirit is the Spirit of the Father, which “proceedeth from the Father,” (John 15:26) yet at times, the Holy Spirit is called, “the Spirit of Christ.” For example, compare 1 Peter 1:11 and 2 Peter 1:21. Both of these are true, for Jesus received His Father’s Spirit without measure (John 3:34), so that the Son has His Father’s Spirit. The Bible says that God sends us His Spirit through His Son. “Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost; Which he shed on us abundantly through Jesus Christ our Saviour.” (Titus 3:5, 6) By this process we gain the added benefit of receiving not only the Spirit of the Father, but also the Spirit of His Son. Jesus said, “If a man love me, he will keep my words: and my Father will love him, and we will come unto him, and make our abode with him.” (John 14:23) Paul wrote, “because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father.” (Galatians 4:6)
Jesus said, “I am in the Father, and the Father in me.” (John 14:10) If we receive the Spirit of one (the Father or the Son), we automatically receive the Spirit of the other, for they dwell in each other the same way they dwell in us, by their Spirit. “Whosoever denieth the Son, the same hath not the Father: (but) he that acknowledgeth the Son hath the Father also.” (1 John 2:23) “Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son.” (2 John 1:9)