Before he disappeared, Jesus promised that he would send his disciples the help of the Holy Spirit from heaven. This promise was fulfilled seven weeks later, When the disciples were all together in a room. There was a sound of rushing wind and strange tongues of flame appeared over the disciples' heads. They than found that they were able to speak many difference foreign languages, so they could teach the Christian religion to people of all nationalities. This coming of the Holy Spirit is celebrated by Christians at the Festival of Pentecost, or Whitsun (the 7 Sunday after Easter) and the Sunday after Whitsun is called Trinity Sunday