Römer 11:16

For--"But" if the first-fruit be holy, the lump is also holy; and if the root . . . so the branches--The Israelites were required to offer to God the first-fruits of the earth--both in their raw state, in a sheaf of newly reaped grain (Lev 23:10-11), and in their prepared state, made into cakes of dough (Num 15:19-21) --by which the whole produce of that season was regarded as hallowed. It is probable that the latter of these offerings is here intended, as to it the word "lump" best applies; and the argument of the apostle is, that as the separation unto God of Abraham, Isaac, and Jacob, from the rest of mankind, as the parent stem of their race, was as real an offering of first-fruits as that which hallowed the produce of the earth, so, in the divine estimation, it was as real a separation of the mass or "lump" of that nation in all time to God. The figure of the "root" and its "branches" is of like import--the consecration of the one of them extending to the other.

The apostle, having reconciled that great truth of the rejection of the Jews with the promise made unto the fathers, is, in this chapter, further labouring to mollify the harshness of it, and to reconcile it to the divine goodness in general. It might be said, "Hath God then cast away his people?" The apostles therefore sets himself, in this chapter, to make a reply to this objection, and that two ways: - I. He shows at large what the mercy is that is mixed with this wrath (v. 1-32). II. He infers thence the infinite wisdom and sovereignty of God, with the adoration of which he concludes this chapter and subject (Rom 11:33-36).

11:16 the entire batch of dough is holy because the portion given as an offering is holy: This imagery comes from Num 15:17-21, where God commanded the Israelites to take part of their first batch of dough and set it aside as a gift. God’s promises to and blessings on Abraham, Isaac, and Jacob were like a down payment, guaranteeing the completion of God’s work among his people.