And the two doors were of fir wood: the two leaves of the one door were folding, and the two leaves of the other door were folding.
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Bede
AD 735
Just as the entrance to the inner sanctuary by which one reached the ark of the Lord and the cherubim signifies the entrance to the kingdom of heaven whereby we hope and desire to be introduced to the vision of our Creator and the heavenly citizens, so the entrance into the temple shows in type the beginnings of our life oriented on God when we enter the church of this present time. The latter entrance denotes our entry into the faith, the former our entry into vision. Hence the posts of this entrance were foursquare because of the four books of the holy gospel by whose teaching we are instructed in the true faith, or because of the four cardinal virtues of prudence, fortitude, temperance and justice, on whose most firm foundation, as it were, every edifice of good actions rests; prudence, by which we learn what we ought to do and how we ought to live; fortitude, through which we carry out what we have learned must be done; and the prophet briefly sums up these virtues in one verse, sa...
Fir-tree, or some species of cedar, ver. 15.
Double. In the large doors, other smaller were made, that the priests might pass more easily. (Menochius)
And so Literally, "and holding each other, was opened. "Both the great and the small doors might open at the same time; (Sanchez) or rather the latter would afford a passage, while the great folding doors were shut. (Menochius)
Perhaps both the doors of the holy place and of the sanctuary were so connected, that both opened together. (Tract. Middot. iv. 1.) (Calmet)
But the sanctuary would never be thus exposed to public view. Protestants, "two leaves of one door were folding "(Haydock)