יחזקאל, פרק מ״ח, פסוק ל״ב

The architectural layout of the future city is planned with exact dimensions and designated entry points. On the eastern border of the city [מצודת ציון], the boundary stretches across a carefully measured distance of four thousand five hundred units. Built into this eastern side are three separate gates, each carrying a specific name to identify it [מצודת דוד].