'Sabbath' in the Bible

This is the thing that you shall do. A third part of you, who come in on the Sabbath, of the priests and of the Levites, shall be porters of the thresholds.

So the Levites and all Judah did according to all that Jehoiada the priest commanded: and they took every man his men, those who were to come in on the Sabbath; with those who were to go out on the Sabbath; for Jehoiada the priest didn't dismiss the shift.

to fulfill the word of Yahweh by the mouth of Jeremiah, until the land had enjoyed its Sabbaths: [for] as long as it lay desolate it kept Sabbath, to fulfill seventy years.