The old Pentecost was 50 days from the Sunday during Passover season (Leviticus 23:15-22; Deuteronomy 16:9-12), the day when a holy meal was first waved before God and then consumed by the worshiper. In John 14:8-27 Jesus foretold a time when he would leave and send the Holy Spirit. Acts 2 is the fulfilment of that prophecy. The Holy Spirit is our comforter or legal advocate, who sits alongside of all of us who are in the church like a lawyer does in court as someone on our side. We cannot find the Holy Spirit in the world, but only in the community of believers. The Holy Spirit makes it possible for the work of Jesus to continue in the church after his departure. He does this by teaching and reminding us of the things of God.