What exactly are you looking for?
There are biblical references to the three persons of the Godhead. Several times in the New Testament we see all three persons mentioned together. Two of the most popular Trinity supporting passages are:
Matthew 5
16 When He had been baptized, Jesus came up immediately from the water; and behold, the heavens were opened to Him, and He saw the Spirit of God descending like a dove and alighting upon Him.
17 And suddenly a voice came from heaven, saying, “This is My beloved Son, in whom I am well pleased.”
Matthew 28
19 "Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit
Here is how the historic Christian leaders viewed this truth:
110 AD. Ignatius of Antioch wrote,
“Wherefore also the Lord, when He sent forth the apostles to make disciples of all nations, commanded them to “baptize in the name of the Father, and of the Son, and of the Holy Ghost,” not unto one [person] having three names, nor into three [persons] who became incarnate, but into three possessed of equal honour.” (Letter to the Philadelphians, 2)
In Matthew 5 we see the Father, Son and Holy Spirit together and distinct. Matthew 28 commands us to make disciples and baptize them in the name of the Triune God. In Titus we are given the same picture that we have in Matthew. Look at Titus 3:
4 But when the kindness and the love of God our Savior toward man appeared,
5 not by works of righteousness which we have done, but according to His mercy He saved us, through the washing of regeneration and renewing of the Holy Spirit,
6 whom He poured out on us abundantly through Jesus Christ our Savior,
The kindness and love of God appeared, we are renewed by the Holy Spirit who is poured out on us through Jesus Christ.
Oops! There was an Early Church Father in there. But that’s the point…the Church developed its understanding of the Trinity over time. The Bible only gives us the basis for the doctrine. Frankly, I think you’d have a hard time coming up with “one God, three persons” and “the Spirit proceeding from the Father and the Son” apart from the core theology given to you by the Catholic Church.