Romans 11:16

"For if the first-fruits be holy, the lump also is holy; and if the root be holy, so are the branches;" So calling in this passage by the names of the first-fruit and root Abraham, and Isaac, and Jacob, the prophets, the patriarchs, all who were of note in the Old Testament; and the branches, those from them who believed. Then since the fact met him that many had disbelieved, observe how he undermines it again...

The "first fruits" refers to Christ in his human nature, the root is Abraham the patriarch and the branches of the olive tree are the Jews who descended from the root.

It is clear that they are one and the same substance, so it is impossible for the offering to be holy and the lump unclean, given that the offering comes from the lump. Thus Paul shows that those whose ancestors believed cannot be regarded as …

Then when he says, for if the firstfruit, he proves the same thing by considering the status of the Jewish race. This he does in two ways. First, on the part of the apostles, when he says: if the firstfruit be holy, so is the …

He calls the patriarchs the "firstfruit" and the "root," and those of their descendants who believed the "lump" and the "branches." So he comforts the unbelieving Jews, saying: you too will be holy if you believe. For it is necessary that the lump and the …

For if the firstfruit be holy,.... Some by "the firstfruit" and "root" understand Christ, who is sometimes called, "the firstfruits of them that slept", 1Co 15:20, and "the root of Jesse and David", Isa 11:10, and indeed of all the righteous; and certain it is, that since he is holy, has all the holiness of his people in him, and is sanctification unto them, they shall be holy likewise; have it imparted to them in this life, and perfected in them in another: but this does not seem to agree with the apostle's argument.

Some by the first-fruits understand those of the Jews that were already converted to the faith of Christ and received into the church, who were as the first-fruits dedicated to God, as earnests of a more plentiful and sanctified harvest. A good beginning promises a good ending.

And this will surely come to pass. For if the first fruits be holy, so is the lump - The consecration of them was esteemed the consecration of all and so the conversion of a few Jews is an earnest of the conversion of all the rest.

For if the first fruit be holy - As the consecrating the first fruits to God was the means of drawing down his blessing upon the rest, so the conversion of Abraham to the true faith, and the several Jews who have now embraced Christianity, are pledges that God will, in process of time, admit the whole Jewish nation into his favor again, so that they shall constitute a part of the visible Church of Christ.

The figure of the "root" and its "branches" is of like import--the consecration of the one of them extending to the other.

For if the first-fruit be holy - The word “first-fruit” ἀπαρχή aparchē used here denotes the firstling of fruit or grain which was separated from the mass and presented as an offering to God. The Jews were required to present such a portion of their harvest to God, as an expression of gratitude and of their sense of dependence; Num 15:19-21. Until this was done, it was not lawful to partake of the harvest. The offering of this was regarded as rendering the mass holy, that is, it was lawful then to partake of it. The first-fruits were regarded as among the best portions of the harvest; and it was their duty to devote to God that which would be the best expression of their thanksgiving. This was the general practice in relation to all that the land produced. The expression here, however, has reference to the small portion of dough or kneaded meal that was offered to God; and then the mass or lump φύραμα phurama was left for the use of him who made the offering; Num 15:20. Be holy - Be set apart, or consecrated to God, as he commanded. The lump - The mass. It refers here properly to the dough of which a part had been offered. The same was true also in relation to the harvest, after the waive-sheaf had been offered; of the flock, after the first male had been offered, etc. Is also holy - It is lawful then for the owner to partake of it. The offering of a part has consecrated the whole. By this illustration Paul doubtless means to say that the Jewish nation, as a people, were set apart to the service of God, and were so regarded by him. Some have supposed that by the first-fruit here the apostle intends to refer to the early converts, made to the Christian faith in the first preaching of the gospel. But it is more probable that he refers to the patriarchs, the pious people of old, as the first-fruits of the Jewish nation; see Rom 11:28. […]