http://www.soniclight.comNotes on 1 John 2008 Edition by Dr. Thomas L. Constable
The Greek word translate "Advocate" is
parakleton that transliterated into English is "Paraclete." It means one who gets called to the side of another to help.
Jesus Christ did not just make satisfaction for our sins, though He did that. He is the satisfaction Himself. The Septuagint translators used the same Greek word translated "propitiation" here (
hilasmos, satisfaction, cf. 4:10) to translate the "mercy seat" on the ark of the covenant. Jesus' body was the site where God placated His wrath against sin. Verses 1:5-2:2 all have Old Testament tabernacle connotations. Jesus' death not only expiated (cleansed) sins, but it satisfied God's wrath against sin.