Ambrose of Milan, on Num 17:8

“He returned on the following day, and found that the rod of Aaron for the house of Levi, was budded: and that the buds swelling it had bloomed blossoms, which spreading the leaves, were formed into almonds.”

“For Paul came to preach the cross of the Lord, always green like the holly oak, and the nuts, which have a harder shell and a tender fruit, and rightly so, for the priestly rod of Aaron was a nut tree, and the staff of Jeremiah was of the same kind. Who would doubt that silver is also a dual-purpose, not idle gift; when both the life of the Patriarchs and the discourse of the Apostles always flourish in the hearts of individuals; and the speech of the saints, like silver tested by fire, shines with the bright light of salutary instruction? And not without reason do they refer to dual-purpose silver in which the coming of Paul was prefigured, who bestowed double honor on the laboring elders in word and doctrine.”

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