1 Then the angel showed me the river of the water of life—water as clear as crystal—pouring out from the throne of God and of the Lamb, 2 flowing down the middle of the city’s main street. On each side of the river is the tree of life producing twelve kinds of fruit, yielding its fruit every month of the year. Its leaves are for the healing of the nations. 3 And there will no longer be any curse, and the throne of God and the Lamb will be in the city. His servants will worship him, 4 and they will see his face, and his name will be on their foreheads. 5 Night will be no more, and they will not need the light of a lamp or the light of the sun, because the Lord God will shine on them, and they will reign forever and ever. 6 Then the angel said to me, “These words are reliable and true. The Lord, the God of the spirits of the prophets, has sent his angel to show his servants what must happen soon.”

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