Trinity scriptures...
"Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:" - Matthew 28:19
If Jesus and the Father are only in the Godhead, why did Jesus put Holy Ghost as a third person into the name of the Lord is established? Because they are all one Lord in three persons.
"For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one." ! 1 John 5:7-8
It just stated all three persons bore record of this truth, and that all three are one....How can you deny that?
"But the Comforter, [which is] the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you." -John 14:26
Jesus doesn't claim to be the Holy Ghost, although Jesus is filled with the Spirit. Obviously the Spirit is mentioned as another person sent and came from the Father.