The promise of my Father - The promise which the Father had made to them “through” the Saviour. See Matthew 10:19; John 14:16-17, John 14:26. The promise was, that they should be aided by the power of the Holy Spirit. He also doubtless referred to the promise of God, made in the days of Joel, respecting the outpouring of the Holy Spirit. See Joel 2:28-29, compared with Acts 2:16-21.
Endued with power from on high - The power which would be given them by the descent of the Holy Spirit - the power of speaking with tongues, of working miracles, and of preaching the gospel with the attending blessing and aid of the Holy Spirit. This was accomplished in the gift of the Holy Spirit on the day of Pentecost. See Acts 2.