Therismós (θερισμός) means harvest — the reaping of grain at the end of the growing season. Biblically, it becomes a rich metaphor for the gathering of souls in evangelism and final judgment.
Jesus uses therismós in multiple ways. Matthew 9:37-38: 'the harvest is plentiful but the workers are few' — a call to urgent evangelism. Matthew 13:39: 'the harvest is the end of the age' — final judgment when angels separate righteous from wicked. John 4:35: 'open your eyes, the fields are ripe for harvest!' Harvest theology demands urgency: seasons pass, opportunity closes, and God calls His people to participate in His redemptive work before the final reaping.