This article seeks to extend the Pentecostal practice of 'waiting on the Holy Spirit' to biblical interpretation: to wait on the Spirit is to await the filling of the Spirit to illumine Scripture's witness to God's plan of salvation in a way impossible otherwise. Support for this idea is retrieved from a study of the risen Jesus' parting instruction for his apostles to await the Spirit's baptism in Jerusalem (Acts 1.4), which considers Luke's narration of this event in its compositional and canonical settings. This article seeks to extend the Pentecostal practice of 'waiting on the Holy Spirit' to biblical interpretation: to wait on the Spirit is to await the filling of the Spirit to illumine Scripture's witness to God's plan of salvation in a way impossible otherwise. Support for this idea is retrieved from a study of the risen Jesus' parting instruction for his apostles to await the Spirit's baptism in Jerusalem (Acts 1.4), which considers Luke's narration of this event in its compositional and canonical settings.