Below is the Greek text of John 15:1-7
I did not mention the Old Testament because it was first written in Hebrew, and learning it is another subject.
Step 1: Learn Greek or use some Greek language tools?
Below is a screen shot from a Wikipedia article on James Strong and Strong's Concordance. Strong assigned a number to each Greek and Hebrew word used in the Bible. He listed passages from the Bible grouped according to the English word used in the King James Translation, but he also attached the number key for the word in the original text of each passage listed. Users do not need to know how to read the Greek or Hebrew alphabets, nor how to pronounce the original words. They need only find all entries with the same number and compare those. Since the advent of computers, there are many programs that help you do this electronically. What took hours with a bound paper concordance now takes minutes with a computer program.