Another interpretation: by the merit of the tribes [the world was created], as it is said, "and these are the names of the tribes" (Ezekiel 48:1), "all these are the tribes of Israel" (Genesis 49:28). Everywhere it says "these," it invalidates what came before; "and these" adds to what came before. Here it says "these" [in Genesis 2:4], invalidating chaos and void and darkness.
Rabbi Yehudah says: "and the heaven and the earth were finished" (Genesis 2:1), each in its time; "and all their host," each in its time. Rabbi Nechemyah said to him: but is it not written, "these are the generations of the heaven and the earth when they were created," meaning that on the day they were created they brought forth their generations? Rabbi Yehudah said to him: but is it not written, "there was evening and there was morning, one day" (Genesis 1:5), second, third, fourth, fifth, sixth? Rabbi Nechemyah said: they were like gatherers of figs, each one appearing in its own time; "and the earth brought forth grass" (Genesis 1:12), the grass that had been entrusted to its keeping.
"For in six days the LORD made the heaven and the earth, the sea" (Exodus 20:11). These three things, their creation was made and they waited three days each and brought forth three generations each. The earth on the first, according to the House of Hillel, and waited three days, first, second, third, and brought forth three generations: trees, grasses, and the Garden of Eden. The firmament on the second, and they waited three days, second, third, fourth, and brought forth three generations: sun and moon and constellations. The sea on the third, and waited three days, third, fourth, fifth, and brought forth three generations: birds and fish and Leviathan. Rabbi Azaryah did not say so, but: "on the day the LORD made earth and heaven" (Genesis 2:4), two things are the essence of the world's creation, they waited three days and their work was completed on the fourth. Heaven on the first according to the House of Shammai, they waited three days, first, second, and third, and their work was completed on the fourth, and what was the completion of their work? The luminaries. The earth on the third, "and the earth brought forth grass" (Genesis 1:12), and waited three days, third, fourth, fifth, and their work was completed on the sixth, the human being, as it is said, "I made the earth and created the human upon it" (Isaiah 45:12).
"Generations": every [occurrence of] "generations" in Scripture is spelled deficient [without the second letter vav], except for two: "these are the generations of Perez" (Ruth 4:18) and this one. And why are they deficient? Because of six things that were taken from Adam: his radiance, his life, his height, the fruit of the earth, the fruit of the tree, and the luminaries. His radiance, from where? As it is said, "You change his face and send him away" (Job 14:20). His life, from where? "And to dust you shall return" (Genesis 3:19). His height, from where? As it is said, "and the man hid himself" (Genesis 3:8); his height had been a hundred cubits. The fruit of the earth and the fruit of the tree, as it is said, "cursed is the ground for your sake" (Genesis 3:17). The luminaries were struck at the going out of the Sabbath, and they will not yet return to their full repair until the son of Perez comes. "These are the generations of Perez": his radiance, from where? "And those who love Him are like the going forth of the sun" (Judges 5:31). His life, from where? As it is said, "like the days of a tree shall be the days of My people" (Isaiah 65:22). His height, from where? As it is said, "and I will make you walk upright [kommemiyut]" (Leviticus 26:13), with erect stature, and you shall not fear any creature.