Bede, on 1Kgs 7:31

“The mouth also of the laver within, was in the top of the chapiter: and that which appeared without, was of one cubit all round, and together it was one cubit and a half: and in the corners of the pillars were divers engravings: and the spaces between the pillars were square, not round.”

“The mouth of the laver was one cubit on account of the unity of confession and faith because we are all baptized in the confession of the Father and the Son and the Holy Spirit, as the apostle says: "One Lord, one faith, one baptism, one God and Father of all." And the mouth itself was at the top of the capital to teach that the way to the heavenly kingdom had been opened to us through baptism. But the actual laver was a cubit and a half in size, in view, no doubt, of the perfection of good works and the beginning of contemplation. For the whole cubit in the laver denotes the perfection of good works.”

Imported from an open dataset — not yet checked against the printed edition.