Jesus was frequently called “rabbi,” a Hebrew term meaning teacher or master, by His disciples, followers, and others. While there was no formal ordination process in His day, He taught Scripture with authority, trained disciples, and guided people in living according to God’s law. While people still called Him a rabbi, Jewish leaders questioned His authority as He taught differently than the rabbis of the day. Ultimately, Jesus was far more than a rabbi, claiming to be the Messiah and Son of God.
During the early first century, Jewish sages or rabbis would take on disciples and train them in specific interpretations of Jewish law. Each rabbi had his own opinion and their teaching was referred to as a "yoke." Based on a person's behavior and mannerisms, others could tell which rabbi he followed. This list of regulations ruling one's behavior is what Jesus referred to when He said, "My yoke is easy, and my burden is light" (Matthew 11:30). He meant that His teaching would not add to God's law placing undue burdens on His followers the way so many other rabbis' "yokes" were prone to do.
Today, becoming a rabbi requires attending four to five years of rabbinical training which encompasses academic programs, internships, and life experience, including spending one year in Israel before being officially ordained. So by today's standards, Jesus was not a rabbi. However, during His day, with the historical meaning and use of the word, He certainly was an expert of Scripture with a following of disciples He trained in biblical living and thus rightly bore the title of rabbi.
It is important to note that rabbi is not the only title Jesus claimed for Himself. He was no mere mortal interpreting God's law, but rather Jesus claimed to be God Himself (John 8:58). He confirmed that He was the Jewish Messiah (Matthew 16:15–17) and on more than one occasion God declared to everyone present that Jesus was His Son (Matthew 3:17; 17:5). So while Jesus was a rabbi during His day, He is actually so much more.