The angels holding back the four winds of chaos (and judgement) from blowing across the whole world and wrecking havoc - till all the Christians have been decided once and for all (Revelation 7:1-3; 22: 11, 12). The 144,000. (The tribe of Dan is left out for some reason, maybe because it would be 13 and 13 is a bad number). Praise from the great throng of believers in front of the Throne and before the Lamb.