I like what John MacArthur adds to this and how he explains why people were coming to be baptized:
Jesus was ALSO baptized. Also. It wasn't a single act that occurred in isolation and it was a public event and something that others were doing as well. In fact, Jesus was practically ordinary as he arrived that day...so ordinary that John didn't even recognize Him.
Now when Jesus comes from Nazareth to Galilee to be baptized at the age of about thirty, He comes from obscurity. He has lived for thirty years in real obscurity. Obscurity as far as the people of Israel knew, He had no ministry, He had no public persona, He had no public profile. In fact, He was utterly unknown to the people of His own town Nazareth. In fact, when He announced Himself to be the Messiah there, they sought to kill Him. There was nothing about Him that would indicate He was God in human flesh, nothing about Him as you might be surprised to hear, in spite of the Medieval paintings. He didn't have a halo around His head and He didn't wear some special heavenly garb. There was no emanating light coming from Him. He was living in obscurity for thirty years, working in the obscure town of Nazareth as a part of His father's business as a carpenter. But it is time now for Him to begin His ministry, time for Him to start His life work and fulfill His divine commission....
So, a seemingly ordinary guy...comes to be baptized by John...along with many others...in the Jordan River. Yet, this was no ordinary man and this was no ordinary baptism. In fact, this is a significant piece of scripture because it perfectly illustrates the oneness of the trinity.
So, it turns out this was not an ordinary baptism like the many John would have done before, this time it was different. This was the Messiah...the one John was here to prepare the way for...the one who would save all human kind. This was different. This was not a baptism for repenting of sin. It was a different kind of submission:
God. instituted. it.
Jesus did what God asked of Him. He was in constant communication with God--even while being baptized. Jesus was always righteous and always obedient to God's instructions. Jesus is righteous. Righteousness is what allows Jesus to be our Saviour. Righteousness is what grants Jesus the ability to pay our debt. Righteousness allows us to switch places with Jesus.
Wow. We have lived a perfect life. Not on our own, but through our redemption through the righteousness of Jesus. His obedience bought our salvation. It was not our works, not our words, not anything we did but it was because of what Jesus did for us. Through Him we are saved.
Tomorrow's scripture focus: Luke 3:23-28