Why Shabbat Counts Like Every Commandment

Rabbi Levi said: If Israel were to keep the Sabbath properly even for a single day, the son of David would come. Why? Because it is weighed as equal to all the commandments. Rabbi Eleazar bar Avina said: We find in the Torah, in the Prophets, and in the Writings that the Sabbath is weighed as equal to all the commandments. From the Torah, whence? For at the time when Moses forgot to tell them the commandment of the Sabbath, the Holy One, blessed be He, said to him: "How long do you refuse to keep My commandments" (Exodus 16:28), and what is written after it: "See that the LORD has given you the Sabbath" (Exodus 16:29). The Holy One, blessed be He, said to Israel: If you merit to keep the Sabbath, I account it to you as though you had kept all the commandments that are in the Torah; and if you profane it, I account it to you as though you had profaned all the commandments.