The Meaning of Numbers: The Number 30
The number thirty, being 3 x 10, denotes in a higher degree the perfection of Divine order, as marking the right moment. Jesus was Thirty years of age at the commencement of His ministry. Joseph, a type of Jesus, was the same age. King David also, when he began to reign over Israel, was 30 years old:
"Now Jesus Himself began His ministry at about thirty years of age . . ." (Luke 3:23, NKJV throughout)
"Joseph was thirty years old when he stood before Pharaoh king of Egypt." (Genesis 41:46)
"David was thirty years old when he began to reign, and he reigned forty years." (2Samuel 5:4)
Additional commentary on the Biblical Meaning of 30 *
The number 30 pictures dedication. Aaronic priests were dedicated to serve at age 30. John the Baptist, the son of a priest, began his ministry at age thirty, six months before Jesus began His at age thirty. Thirty also portrays the blood of Christ.
The number thirty and the betrayal of Jesus
Judas betrayed Jesus for 30 pieces of silver. When he threw the silver back into the temple, the priests rejected it as an offering but decided instead to buy a field - which was a fulfillment of an ancient prophecy:
"But the chief priests took the silver pieces and said, 'It is not lawful to put them into the treasury, because they are the price of blood.' And they consulted together and bought with them the potter’s field, to bury strangers in. Therefore that field has been called the Field of Blood to this day.