Midrash for Nehemiah 9:13
וְעַ֤ל הַר־סִינַי֙ יָרַ֔דְתָּ וְדַבֵּ֥ר עִמָּהֶ֖ם מִשָּׁמָ֑יִם וַתִּתֵּ֨ן לָהֶ֜ם מִשְׁפָּטִ֤ים יְשָׁרִים֙ וְתוֹר֣וֹת אֱמֶ֔ת חֻקִּ֥ים וּמִצְוֺ֖ת טוֹבִֽים׃
Thou camest down also upon mount Sinai, and spokest with them from heaven, and gavest them right ordinances and laws of truth, good statutes and commandments;
Shemot Rabbah
According to Rabbi Levi: If all of Israel were to keep Shabbat properly for even a single day, the Messiah ben David would come. Why? because it is equivalent to all of the commandments, as it is said (Ps. 95:7) "for He is our God, and we are the people He tends, the flock in His care. O, if you would but heed His charge this day:"
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