We read in Parashat Lekh-Lekha (chapter 15) of the berit bein ha-betarim (literally, “covenant between the pieces”), the covenantal ceremony during which God promises Avraham that he will father a large nation that will live in Canaan. At one point during this ceremony, we are told, “The sun was about to set, and a deep sleep came upon Avraham; behold, great dark descended upon him” (15:12). As Avraham slept in the darkness, God warned him of the bondage to which his descendants would be subjected, and promised that they will ultimately emerge as a free nation and return to Canaan. As Rashi explains, the setting of the sun and the darkness that descended upon Avraham symbolized the darkness and suffering of the Egyptian exile, of which God informs Avraham in this prophecy. The Netziv, in his Ha’amek Davar, adds that the word shemesh (sun) is sometimes used to signify the overt manifestation of divine providence in the world. He cites as an example a verse in Sefer Tehillim (84:12) – “Ki shemesh u-magen Hashem Elokim” (“For the Lord God is a sun and shield”). The setting of the sun in this prophecy to Avraham thus represents the concealment of divine providence during Benei Yisrael’s periods of exile and oppression, when it appears as though God has forsaken them, Heaven forbid, and no longer takes interest in their well-being.
Rav Meir Simcha Ha-kohen, in his Meshekh Chokhma, makes a fascinating observation in his comments to this verse, namely, that it is here that the Torah uses the word shemesh for the first time. In Parashat Bereishit, in describing the creation of the sun, the Torah (1:16) refers to it as ha-ma’or ha-gadol – “the large luminary.” The word shemesh, however, the primary Hebrew word for “sun,” appears for the first time only here, in God’s prophecy to Avraham.
The Meshekh Chokhma explains that the word shemesh evolves from the Aramaic verb (which is also used in modern Hebrew) sh.m.sh., which means “serve.” (The only instance of this verb in Tanakh is in Sefer Daniel 7:10.) Avraham succeeded in turning the sun back into a shemesh – a servant, or attendant, of the Almighty, rather than an independent supernatural force. The Rambam famously describes in the beginning of Hilkhot Avoda Zara how idolatry evolved to the point where its followers did not acknowledge the existence of a single, divine entity governing the natural world. They instead ascribed divine power and authority to the various forces of nature. Avraham’s struggle against paganism entailed proving that the sun is but a shemesh – a subordinate force, in the “service,” so-to-speak, of the Almighty. For this reason, the Meshekh Chokhma suggests, it is only when Avraham emerges on the scene and launches his campaign against polytheism that the sun became called shemesh, which emphasizes its dependence upon and subservience to God, contrary to the pagan attribution of intrinsic divine powers to the celestial bodies.