Hepta is the Greek word for seven. It is one of the most theologically significant numbers in both Testaments — seven representing completeness, fullness, and divine perfection. The number seven pervades Revelation: seven churches, seven seals, seven trumpets, seven bowls, seven stars, seven lampstands, seven spirits of God. Seven also structures creation (Gen 1), the covenant (the Sabbath as the seventh day), and the calendar (seventh year = Sabbath year; 49th + 1 = Jubilee).
Seven (hepta) is the number of divine completeness and covenant wholeness. The Sabbath on the seventh day declares that God's creative work is complete — and humanity's participation in rest is the seal of that completion. When Peter asks whether forgiving seven times is sufficient (Matt 18:21), Jesus replies 'seventy-seven times' (or seventy times seven) — meaning unlimited, complete, perfect forgiveness that can never be exhausted. In Revelation, the seven-fold repetition of signs and judgments communicates not merely quantity but the completeness of God's sovereign action over all of history.