From His youth, Jesus obeyed all that was required of Him by our Heavenly Father. Under the guidance of Mary and Joseph, Jesus grew much as other children grow. He loved and obeyed the truth. Luke tells us, “And the child grew, and waxed strong in spirit, filled with wisdom: and the grace of God was upon him” (Luke 2:40; see also D&C 93:12–14).
By the time He was 12 years old, Jesus had grown in His understanding that He had been sent to do the will of His Father. He went with His parents to Jerusalem. When His parents were returning home, they discovered that He was not with their group. They went back to Jerusalem to look for Him. “After three days they found him in the temple, sitting in the midst of the doctors, and they were hearing him, and asking him questions” (Joseph Smith Translation, Luke 2:46). “And all that heard him were astonished at his understanding and answers” (Luke 2:47).
Joseph and Mary were relieved to find Him, but “they were amazed: and his mother said unto him, Son, why hast thou thus dealt with us? behold, thy father and I have sought thee sorrowing.” Jesus answered her, saying, “Wist ye not that I must be about my [Heavenly] Father’s business?” (Luke 2:48–49).
In order to fulfill His mission, Jesus was to do the will of His Father in Heaven. “I do nothing of myself,” He declared, “but as my Father hath taught me, I speak these things. … I do always those things that please him” (John 8:28–29).
When Jesus was 30 years old, He came to John the Baptist to be baptized in the Jordan River. John was reluctant to baptize Jesus because he knew that Jesus was greater than he. Jesus asked John to baptize Him in order “to fulfil all righteousness.” John did baptize the Savior, immersing Him completely in the water. When Jesus was baptized, His Father spoke from heaven, saying, “This is my beloved Son, in whom I am well pleased.” The Holy Ghost descended, as shown by the sign of the dove. (See Matthew 3:13–17.)
Soon after Jesus was baptized, He fasted for 40 days and 40 nights to be with God. After that, Satan came to tempt Him. Jesus firmly resisted all of Satan’s temptations and then commanded Satan to leave. (See Matthew 4:1–11; see also Joseph Smith Translation, Matthew 4:1, 5–6, 8–9, 11.) Jesus Christ remained sinless, the one perfect being to ever walk the earth (see Hebrews 4:15; 1 Peter 2:21–22).