At the heart of the Sabbath command stands a theological riddle. Targum Pseudo-Jonathan preserves it faithfully: "In six days the Lord created and perfected the heavens and the earth; and in the seventh day He rested and refreshed" (Exodus 31:17).
The Hebrew word is vayinafash — literally, "was re-souled." God did not merely stop. God was refreshed. The verb is strange enough that the sages of the Talmud (Beitzah 16a, c. 500 CE) engaged with it at length.
Does the Creator need rest?
Obviously not in any physical sense. The God of Israel does not tire. So why does the Torah use a word of recovery? The sages offered a striking answer. God did not rest because God was exhausted. God rested because the world now needed the Sabbath. Creation, in the rabbinic imagination, was incomplete without a seventh day. A world that ran endlessly would have been like a song without rests between the notes — noise, not music. The Sabbath was the rest that made the six days into a melody.
And vayinafash — the re-souling — was the moment the rest became a gift. God poured soul into the seventh day, charging it with a presence the other days did not have. The sages taught that Jewish souls receive an extra neshamah yeteirah (an additional soul) on Sabbath eve, drawn from the reservoir of re-souling that God placed in the day itself (Taanit 27b).
This is why Sabbath is called a sign between My Word and Israel forever. The sign is not just the cessation of work. It is the quiet knowledge that the seventh day carries an extra soul, and that extra soul is available to any Jew who enters the day with the right intention.
The Maggid takes this home: when you rest on Shabbat, you are not only stopping work. You are receiving soul. The day itself is charged, and it shares its charge with whoever shows up.