Here is a great exposition on the “Doctrine of the Trinity” by Dr. Ed DeVries
The Trinity – a great exposition – “Since God is a triune being, theologians use the word Trinity to represent the complex doctrine through which man comprehends His existence. Since the word Trinity is not found anywhere in the received text or in its offspring (the Authorized Version and other biblical translations derived from the received text), many argue that the doctrine of the Trinity is not Biblical. However, when a person comes to understand the theory embodied in the terminology they can not help but find proof of the Trinity throughout the Bible.”