Halakhah sa Job 37:3: Shulchan Shel Arba

Another interpretation: He blessed it with light. When the sun set on the evening of Shabbat, the Holy One Blessed be He sought to hide the light and gave honor to Shabbat, as it is written, “and God blessed it, etc.”²⁸⁹Gen 2:3.With what did He bless it? With light. Everything began to praise the Holy One Blessed be He, as it is written, “Everything under the heavens, He made it sing.”²⁹⁰Job 37:3: Literally, “He lets it loose [yishrehu] beneath the entire heavens; His lightning [oro] to the ends of the earth.” The midrash treats yishrehu as if it were from the word “shirah” – “song.” Why? “His light [spread] to the ends of the earth.”²⁹¹Genesis Rabbah 11:2.