“But Paul and Barnabas remained in Antioch, teaching and proclaiming (along with many others) the word of the Lord.”
After Judas returned to Jerusalem with the letter about Jewish-Gentile relations, more teaching was needed. Paul, Barnabas and many others taught and evangelized.
Teaching is one of the primary functions in the church of God. It strengthens the church and prepares saints to be proclaimers themselves. The Lord’s word is central to Christians’ experience.