ביכורים א׳:ג׳ - א׳:ד׳

אלא משבעת המינין – As it is written (Deuteronomy 26:2), “And you shall take some of every first fruit of the soil,” and not all of the first [fruit], for all of the fruits are not required for [the ceremony of] First Fruits, other than the seven species through the land of Israel is praised: wheat, barley, [vines, figs, and pomegranates, olives and honey – see Deuteronomy 8:8]; and [the] honey [referred to] is the honey of the date-palm.

מתמרים שבהרים ופירות שבעמקים – because they are inferior [in quality]

ולא מזיתי שמן שאינם מן המובחר – as it is written, (,Deuteronomy 8:8), “a land of olive trees and honey”; olives fit for storage (medium size – see Mishnah Kelim 17:8), upon which rain comes and stores up its oil in it (i.e., does not let it trickle out) and It is the best and praiseworthy.

אין מביאין בכורים קודם לעצרת – The two loaves that we bring on Shavuot are called “Bikkurim”/First Fruits, and these permit [the usage] of new grain in the Temple.

שאינו יכול לומר "אשר נשבע לאבותינו לתת לנו" – Since his ancestors were not from Israel and converts did not take a portion in the land. But Maimonides wrote that the Halakha is not like this Mishnah; rather, the convert brings [the First Fruits] and recites [Deuteronomy 26:5-10] and is able to say, “to our fathers to assign us” (Deuteronomy 26:3), because the Land was given to Abraham and he was the father of converts, as he was for Israel, as it states (Genesis 17:5): “for I make you the father of a multitude of nations.” But we [the Rabbis] expound upon it {Berakhot 13a): “In the past, you were the father of Aram; now you are the father of the entire world.” And similarly, when he [the convert] prays, whether on his own or in the synagogue, he says, “the God of our fathers” even if his mother was not an Israelite.