Where in the bible is the trinity explained or originated from.

I might be wrong here. I'm only just beginning to read about all this, but isn't the Trinity, the Father (God) the Son (Jesus) and the Holy Ghost (Holy Spirit)? this was explained in the Gospel of John. God took Jesus, the son, back to him, but gave the Holy Spirit to the world in his place. the son was God's physical manifestation on earth, and the Holy spirit is God's mental, emotional manifestation on earth.

let me tell you the bible dont refer the specific word Trinity. But as you are having a discission regarding gospel of John there are reerence in the bible indicating Trinity. In the book of Genesis 1:26 and Isaiah 6:8 God is not using me or I instead He is using a plural word Us. Does this not clearly indicate Trinity, or by saying Us is god reffering to the angels no way. Let me give you an example of an egg. An egg is made up of 3 parts Shell, white part and the Yoke which is yellow in colour, all the three can be seperated and kept aside but you cannot take the shell alone and say its aan egg in the same way you cannot take any parts of the egg seperatly and say it as egg. When all the three are joined togeather then its called as egg. They cannot fulfill their purporse staying alone, they need to get togeather for a chick to be fromed from the egg. In the same way God is one there is no doubt,but they are also three. In the book of 1 corinthains 15:27 its very clear and sound. Regarding the father and son. There's one thing i would like to suggest you, dont bug into this too much or you may backslide from God. There are some things which God has kept as mistry and let it be that way and be fool before GOD.