The Holy Ghost
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John 4:24
God is Spirit, and His worshipers must worship Him in spirit and in truth.”
John 14:26
But the Advocate, the Holy Spirit, whom the Father will send in My name, will teach you all things and will remind you of everything I have told you.
Matthew 28:19
Therefore go and make disciples of all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Spirit,