Original sentence: He was dead for over 24 hours, but was resurrected or became alive again afterwards.His teachings were initially spread by a group of twelve followers usually referred to as his disciples or Apostles
Edited sentence: He was dead for 3 days and 3 nights (as prophesied by Old Testament prophets and by his own statements) but was resurrected or became alive again afterwards.His teachings were initially spread by some of these, especially a group of twelve followers usually referred to as his disciples or Apostles