Pesachim 50A

כאיסורו: מה איסורו בכזית, אף חזרתו בכזית.

is analogous to its prohibition. Just as its prohibition is only when it is the size of an olive-bulk, so too, the requirement to return it is only when it is the size of an olive-bulk.

תניא, רבי נתן אומר: זה וזה כשתי ביצים, ולא הודו לו חכמים.

Another opinion on this issue was taught in a baraita. R' Natan says: The minimum measure for both this and that, leaven and sacrificial meat, is two egg-bulks of prohibited material, but the Rabbis did not agree with him.

״והיה ביום ההוא לא יהיה אור יקרות וקפאון״. מאי ״יקרות וקפאון״?

Incidental to the discussion of leaving Jerusalem and its surrounding area, the Talmud cites expositions of a prophetic passage, including a statement that God will eventually expand the boundaries of Jerusalem. The verse states: “And it should come to pass on that day that there should not be light, but heavy clouds [yekarot] and thickness [vekippaon]” (Zechariah 14:6). The Talmud asks: What is the meaning of the expression “yekarot vekippaon”?

אמר רבי אלעזר: זה אור שיקר בעולם הזה, וקפוי לעולם הבא.

R' Elazar said: This is the light currently provided by the sun, which is significant [yakar] in this world and insignificant [kafuy] in the World-to-Come, when the moon will shine as brightly as the sun does now and the sun will be 7 times brighter than it is currently.

רבי יוחנן אמר: אלו נגעים ואהלות, שיקרין הן בעולם הזה, וקפויין הן לעולם הבא.

R' Yoḥanan said: This expression refers to the tractates of Nega’im and Oholot, which are weighty [yekarim] owing to their difficulty in this world, as they are among the most complex subjects, but will be easy [kefuyin] in the World-to-Come, when people will be much wiser.