As I understand it he was, but in those days full manhood was considered to be 30 years old instead of 18 or 21 as it is in most places today and thus he did not become a Rabbi until that age. Yes, Jesus was the greatest teacher (Rabbi) because he was both fully man and fully God at the same time.
**As I understand it he was, but in those days full manhood was considered to be 30 years old...**
There is very little scripture about Jesus after his birth and before his baptism by water and Spirit; just age 12 at the temple schooling the priests and scribes, and his being subject to his mother and adoptive father.
His baptism in water and of Spirit was a birth, for that was when he left behind his old life, and began his calling. First, tempted in the desert, then beginning his great work.
The Israelites left their former life; “...all were under the cloud, and all passed through the sea. And were all baptized unto Moses in the cloud and in the sea.” (1 Cor. 10:1,2). They then went to the wilderness to be tried and tested.
In both cases, what emerged from a desert wilderness was ready to do God’s will