Ezekiel 40:8

He also measured the width of the threshold of the ten-cubit gate, which is a perfect number and is contained either in the Decalogue or in the sacraments of the four Gospels. Whoever begins with one, reaches four in such a way as to fill the number ten.

(Verse 5 and following) And behold, there was a wall surrounding the house on all sides, and in the hand of the man was a measuring reed of six cubits and a handbreadth, and he measured the width of the building with the reed, one reed wide, and the height with the reed, one reed high. And he came to the gate that faced the eastern road, and he went up its steps, and he measured the threshold of the gate with the reed, one reed wide, that is, one reed wide, and the vestibule one reed long, and one reed wide, and between the vestibules five cubits, and the threshold of the gate next to the entrance of the gate inside, one reed wide. And the vestibule of the gate was eight cubits, and the front of it two cubits: but the gate itself was inward. And the chambers of the gate towards the east, three on this side, and three on that side; they measured one against another: and the fronts of the gate on both sides were of one measure. And he measured the length of the porch of the gate, ten cubits: and the breadth of the gate, thirteen cubits. And there was also a space before the chambers, one cubit on this side, and one cubit on that side: and the chambers six cubits on this side, and six cubits on that side. And he measured the gate from the roof of the chamber to its roof, a width of twenty-five cubits, door against door. Seventy: And behold, a wall on the outside of the house all around, and in the man's hand a measuring reed of six cubits and a handbreadth. So he measured the thickness of the wall, one reed; and the height, one reed. Then he went inside the gateway which faced toward the east, went up its stairs and measured the threshold of the gateway, which was one reed wide, and the other threshold was one reed wide. Each gate chamber was one reed long and one reed wide; between the gate chambers were five cubits. […]

The man, whose appearance was like the appearance of bronze, measured the vestibule of the gate at eight cubits, and its front at two cubits. And lest we should believe the vestibule to be outside the gate, it is added: But the vestibule of the gate was on the inside. What is signified by the inner vestibule, if not the breadth of eternal life, which is now conceived in the mind through hope amid the narrow constraints of the present life? Of which it is said through the Psalmist: Enter his gates with confession, his courts with hymns of confessions. For when we confess our sins through tears, we enter the gate of the narrow life. But when after these things we are led to eternal life, we enter the courts of our gate with praises of confessions, because there will no longer be any narrowness there, when the joy of perpetual festivity has received us. On account of the narrowness of our confession, the Truth says: Enter through the narrow gate. And when the Psalmist presumed that he would be received into the breadth of eternal joy, he said: You have set my feet in a spacious place. Therefore one proceeds through the gate to the court, because one arrives at the breadth of solemnity from the narrowness of confession. Those joys, therefore, which are called courts in David, are called the inner vestibule in Ezekiel. Hence this same vestibule is said to have been measured at eight cubits. For there all are to be received who now both labor in the exercise of work and sigh for eternal joys through the grace of contemplation. Nor is it unfitting that the measure of the vestibule is set at eight cubits, because all time unfolds in seven days. For the eternal day, which follows after the completion of the sevenfold succession of days, is indeed the eighth. […]

He measured also the porch of the gate within, one reed. This was either the measure of the breadth of the porch between the opposite chambers on both sides; or rather of the length of that space, which was between the third little chamber and the last gate; and such a space must be supposed to be between the first gate and the first little chamber, which space were three yards and a half; which shows how spacious the churches of Christ will be, and how exactly measured.