Commentaries:
Barnes' Notes
Jerusalem - The people of Jerusalem.
All Judea - Many people from Judea. It does not mean that literally all the people went, but that great multitudes went. It was general. Jerusalem was in the part of the country called Judea. Judea was situated on the west side of the Jordan. See the notes at Matthew 2:22.
Region about Jordan - On the east and west side of the river. Near to Jordan.
Other Barnes' Notes entries containing Matthew 3:5:
Matthew 11:12
Mark 1:4-8
John 1:6
John 1:19
Acts 1:1
Hebrews 3:16
DISCLAIMER: Church of the Great God (CGG) provides these resources to aid the individual in studying the Bible. However, it is up to the individual to "prove all things, and hold fast to that which is good" (I Thessalonians 5:21). The content of these resources does not necessarily reflect the views of CGG. They are provided for information purposes only.