2 And they led me to a place of darkness, and to a mountain whose peak reached to heaven. 3 And I saw the places of the sun and moon and the treasuries of the stars and of the thunder in the utmost depths, where there was a fiery bow and arrows and their quiver, and a fiery sword and all the lightnings. 4 And they took me to the living waters, and to the fire of the west, which receives every setting of the sun. 5 And I came to a river of fire where the fire flows like water and pours into the great sea towards the west. 6 I saw the great rivers and came to the great river and to the great darkness, and went to the place where no flesh walks.

The Gemara asks: And according to that which entered our mind initially, that the sun is white, doesn’t it redden in the morning and evening? The Gemara answers: In the morning it becomes red as it passes over the site of the roses of the Garden of Eden, whose reflections give the light a red hue. In the evening the sun turns red because it passes over the entrance of Gehenna, whose fires redden the light. And there are those who say the opposite in explaining why the sun is red in the morning and the evening, i.e., in the morning it passes over the entrance of Gehenna, while in the evening it passes over the site of the roses of the Garden of Eden.