Bekhorot 51: words to know

רִיבּוּיֵי וּמִיעוּטֵי (ribbuyei umi'utei): Exegetical method of amplifications and restrictions. Rabbi Yehuda HaNasi uses this method to determine what can redeem a firstborn.
כְּלָל וּפְרָט וּכְלָל (kelal uferat uchelal): Generalization followed by a detail followed by a generalization. The Rabbis employ this hermeneutical principle to exclude land and slaves from redemption.
חַיָּיב בְּאַחְרָיוּתוֹ (ḥayyav be'aḥarayuto): Bears financial responsibility for its loss. A father remains obligated to replace redemption money if it is lost before delivery.
דְּבַר תּוֹרָה (devar Torah): According to Torah law. Ulla contrasts biblically effective redemption with a rabbinic decree disqualifying promissory notes.
בְּרָאוּי כִּבְמוּחְזָק (bera'uy kivmuḥzak): Potential inheritance as possessed assets. The mishna establishes that a firstborn does not receive a double portion in prospective assets.