The Tabernacle
The tent of witness raised in the camp, the cloud covering it by day, fire on it by night, and its inmost place alight. Scroll to watch it.
And on the day that the tabernacle was reared up, the cloud covered the tabernacle, namely the tent of the testimony; and at even there was upon the tabernacle as it were the appearance of fire, until the morning. So it was alway: the cloud covered it by day, and the appearance of fire by night.
Numbers 9:15-16, as St Cyril of Alexandria gives it
Thou art the circumscription, so to speak, of Him who cannot be circumscribed; the root of the most beautiful flower; the mother of the Creator; the nurse of the Nourisher; the circumference of Him who embraces all things; the upholder of Him who upholds all things by His word; the gate through which God appears in the flesh; the tongs of that cleansing coal
Methodius, Oration Concerning Simeon and Anna