Nehemiah 13:21-22

"Then I warned them, and said to them, 'Why do you spend the night around the wall? If you do so again, I will lay hands on you!' From that time on they came no more on the Sabbath."

"And I commanded the Levites that they should cleanse themselves, and that they should go and guard the gates, to sanctify the Sabbath day.
Remember me, oh my God, concerning this also, and spare me according to the greatness of Your mercy!"