1:1-5 Our Lord told the disciples the work they were to do. The apostles met together at Jerusalem; Christ having ordered them not to depart thence, but to wait for the pouring out of the Holy Spirit. This would be a baptism by the Holy Ghost, giving them power to work miracles, and enlightening and sanctifying their souls. This confirms the Divine promise, and encourages us to depend upon it, that we have heard it from Christ; for in Him all the promises of God are yea and amen.
4. should not depart from Jerusalem—because the Spirit was to glorify the existing economy, by descending on the disciples at its metropolitan seat, and at the next of its great festivals after the ascension of the Church's Head; in order that "out of Zion might go forth the law, and the word of the Lord from Jerusalem" (Isa 2:3; and compare Lu 24:49).