Acts 11:24
For he was a good man, and full of the Holy Ghost and of faith: and much people was added unto the Lord.
Cross-reference
Acts 11:21 records that many believed when the Lord's hand was with them — the same great number brought to the Lord as in Barnabas' ministry.
Acts 6:5 calls Stephen a man full of faith and the Holy Spirit — the exact phrase used of Barnabas, linking their characters.
Acts 6:3 describes men full of the Spirit and wisdom for service — Barnabas shares that same description of being full of the Spirit and faith.
Acts 2:4 describes the apostles filled with the Holy Spirit at Pentecost — Barnabas similarly is full of the Holy Spirit, showing continuity of Spirit-filled life.
Acts 5:14 says multitudes were added to the Lord — similar phrase to Barnabas bringing a great number to the Lord, though in a different setting.
Matthew 12:35 says a good person brings forth good from good treasure — Barnabas, full of the Spirit, produces good fruit.
Luke 23:50 calls Joseph of Arimathea a good and righteous man — a direct parallel to Barnabas's description.
Ephesians 5:18 commands being filled with the Spirit, which Barnabas exemplifies here as 'full of the Holy Spirit'.