Midrash sobre Êxodo 16:30

The Holy One, blessed be He, observed and sanctified the Sabbath, and Israel is obliged only to observe and sanctify the Sabbath. Know that it is so! Come and see! for when He gave them the Manna, He gave it to them in the wilderness during forty years on the six days of creation, but on the Sabbath He did not give (it) || to them. Wilt thou say that He did not have power enough to give it to them every day? But (the fact was) the Sabbath was before Him; therefore He gave to them bread for two days on the Friday, as it is said, "See, for that the Lord hath given you the Sabbath, therefore he giveth you on the sixth day the bread of two days" (Ex. 16:29). When the people saw that Sabbath (was observed) before Him, they also rested, as it is said, "So the people rested on the seventh day" (Ex. 16:30).