Comentario sobre Exodo 34:26

ראשית בכורי אדמתך THE FIRST OF THE FIRST-FRUITS OF THY GROUND [THOU SHALT BRING INTO THE HOUSE OF THE LORD THY GOD] — but only from the seven kinds of produce which are mentioned as an excellency of thy land (Deuteronomy 8:8) “a land of wheat and barley and vines etc (Mishnah Bikkurim 1:3). The דבש mentioned in this verse is date honey (not that of bees).

THE CHOICEST FIRST-FRUITS OF THY LAND THOU SHALT BRING INTO THE HOUSE OF THE ETERNAL THY G-D. Because He mentioned that they should bring the first-ripe fruits of all that is in their land⁵³⁶Numbers 18:13. — Ramban’s intention of course is to the verse here before us, but as a matter of style he uses similar language referring to that commandment found elsewhere in Scripture. This can be observed in countless instances. to the house of G-d, He placed next to it, Thou shalt not seethe a kid in its mother’s milk. For at the time of bringing the first-fruits of the earth they would also take along all firstlings of cattle, goats and sheep, and at that season the goats have grown up and begin giving milk. Thus they would often bring up the mother with its firstborn whilst it was still a suckling, in order that it should not die. Now those who came to celebrate the festival would enjoy eating the firstlings amongst all tasty foods, together with the priests. That is why He mentioned the prohibition [against seething the kid in its mother’s milk] together with the precept of the first-fruits. In the Book of Deuteronomy, however, He mentioned this commandment together with the laws of prohibited foods,⁵³⁷Deuteronomy 14:21. after He cited the laws of unclean cattle, fish, and unclean fowl, and carrion, for that is the fitting place to mention it, since it is a prohibition concerning eating, and not merely a prohibition against seething it alone, as those wanting in faith and devoid of knowledge think.⁵³⁸Reference is to the Karaites. See Ibn Ezra who writes in a vein similar to that of Ramban. — See also Vol. I, p. 22, where Ramban uses a similar reproof to those who scoff at the words of our Rabbis.

ראשית בכורי אדמתך תביא, by doing this you will assure yourself of success in growing fruit as spelled out in Ezekiel 44,30 וראשית כל בכורי כל...תתנו לכהן להניח ברכה אל ביתך, “the first of all your early ripening crops… you shall give to the priest so that blessing will come to rest on your house.”