Halakha Ulangan 5:13: Mishneh Torah, Sabbath & Mishneh Torah, Negative Mitzvot

The Sages forbade moving some things on Shabbat in the way that he does on [weekdays]. And for what reason did they [promulgate] this prohibition? They said, "And just like the prophets prohibited and commanded that your going on Shabbat not be like your going on [weekdays] and that the speech of Shabbat not be like the speech of [weekdays]—as it is stated (Isaiah 58:13), 'and speak a word'—all the more so should the carrying of Shabbat not be like the carrying of [weekdays. This would be] so that it not be like a [week]day in his eyes, and he come to pick up and fix vessels from one corner to another or from one house to another, or store rocks, and that which is similar to it. As he is surely idle and sits in his house and will seek something with which to occupy himself. And it will come out that he would not have rested, and would nullify the reason [for Shabbat]; as it is stated (Exodus 22:12 and Deuteronomy 5:13), 'in order that he will rest.'"

Not to do work on the Sabbath, as it is said, “…. thou shalt not do any work” (Ex. 20:10).

Not to do work on the Feast of Pentecost, as it is said, concerning it, “….ye shall do no servile work” (Lev. 23:21).