"I John" is a term often used to refer to the first letter of John in the Bible. Synonyms for this term could include "1 John" or simply "John 1." This letter is believed to have been written by John, one of the Apostles of Jesus, and is filled with teachings about love, faith, and fellowship with God. It is a popular book among Christians, and many find its message to be both inspiring and comforting. Whether referred to as "I John," "1 John," or "John 1," the letter remains an important part of the New Testament and a testament to the enduring power of faith.