I know we have Halley's Bible Handbook included in the INFO Pane under stud Bibles which lead me to wonder why EComB is not there as well....
a brief comparison of two sections to me shows they fall into ver similar categories...
1:19–34 The Witness of John the Baptist
In this Gospel, the primary importance of John the Baptist is his witness to the identity of Christ. When emissaries of “the Jews” (here the Pharisees; see v. 24) question John concerning his own identity, he first tells them who he is not — not the Messiah, a second Elijah, or the eschatological prophet anticipated by the Jews (cf. Mal. 4:5–6; throughout this Gospel, “the Jews” can refer to the religious authorities, the Pharisees, or the general populace — which included Jesus and the disciples). Rather, John claims identity as merely the prophesied “voice” whose testimony prepares the world for the arrival of the superior Word. On seeing Jesus, John acknowledges him as the “Lamb of God,” who will atone for the sins of the entire world. The title and image grow out of the Jewish sacrificial system, which prescribes the slaying of lambs and other animals to effect atonement from sin (cf. Leviticus 1). The Baptist’s identification of Jesus as the preexistent, divine redeemer of the world receives validation from John’s witnessing the visible descent of the Holy Spirit on Jesus (cf. Luke 3:22). The Spirit’s remaining “upon” Jesus ensures his baptism of others “with” the Holy Spirit — a baptism superior to the water baptism of John.
“Bethany beyond the Jordan,” where John first carried out his ministry, names an unknown location in Perea (Transjordan, east of Judea), not the town outside Jerusalem where Jesus raised Lazarus and lodged prior to his passion.
Gordon D. Fee and Robert L. Hubbard Jr., eds. The Eerdmans Companion to the Bible. Accordance electronic ed. (Grand Rapids: Eerdmans, 2012), 585.
John 1:19–34 John’s Testimony
After brief statements about the deity of Jesus and his pre-existence and incarnation, John’s Gospel, passing over Jesus’ birth, childhood, baptism, and temptation, starts with the testimony to the deity of Jesus given by John the Baptist to the investigating committee from the Sanhedrin.
This was at the close of the 40 days of Jesus’ temptation (Matthew 4:1–11). It is nowhere stated that Jesus returned from the temptation in the wilderness to the Jordan, where John was baptizing. The three Synoptic Gospels pass directly from the temptation to the Galilean ministry (Matthew 4:11–12; Mark 1:13–14; Luke 4:13–14). But the three successive phrases “the next day” (John 1:29, 35, 43), followed by “the third day” (2:1), on which he arrived in Galilee, make it evident that Jesus, before departing for Galilee, went back from the wilderness to the place where John was preaching.
The Prophet (v. 21) was a descriptive title of the Messiah and was generally understood as such by the people in Jesus’ day (6:14).
Note John’s profound humility in his devotion to Christ (1:27)—he did not consider himself worthy even to untie His shoe—a servant’s job. This is so noteworthy that it is recorded in all four Gospels (Matthew 3:11; Mark 1:7; Luke 3:16). What a powerful statement to the world if all Christians could exhibit the same humble adoration of the Lord!
Lamb of God (John 1:29), a descriptive title of Jesus used only here and in v. 36. John is foretelling that Jesus will be the sacrifice that atones for the sins of the world.
Henry H. Halley, Halley’s Bible Handbook, Deluxe, Accordance electronic ed. (Grand Rapids: Zondervan, 2007), paragraph 7556.