Ambrose of Milan
Catena Aurea · Lukasevangelium 13
He spake also this parable; A certain man had a fig tree planted in his vineyard; and he came and sought fruit thereon, and found none. Then said he unto the dresser of his vineyard, Behold, these three years I come seeking fruit on this fig tree, and find none; cut it down: why cumbereth it the ground? And he answering said unto him, Lord, let it alone this year also, till I shall dig about it, and dung it: And if it bear fruit, well: and if not, then after that thou shalt cut it down.
There was a vineyard of the Lord of hosts, which He gave for a spoil to the Gentiles. And the comparison of the fig tree to the synagogue is well chosen, because as that tree abounds with wide and spreading foliage, and deceives the hopes of its possessor with the vain expectation of promised fruit, so also in the synagogue, while its teachers are unfruitful in good works, yet magnify themselves with words as with abundant leaves, the empty shadow of the law stretches far and wide. This tree also is the only one which puts forth fruit in place of flowers. And the fruit falls, that other fruit may succeed; yet some few of the former remain, and do not fall. For the first people of the synagogue fell off as a useless fruit, in order that out of the fruitfulness of the old religion might arise the new people of the Church; yet they who were the first out of Israel whom a branch of a stronger nature bore, under the shadow of the law and the cross, in the bosom of both, stained with a double juice after the example of a ripening fig, surpassed all others in the grace of most excellent fruits; to whom it is said, You shall sit upon twelve thrones. Some however think the fig tree to be a figure not of the synagogue, but of wickedness and treachery; yet these differ in nothing from what has gone before, except that they choose the genus instead of the species.