Nehemiah 4:23

4:23 We did not change clothes – not I, nor my relatives, nor my workers, nor the watchmen who were with me. Each had his weapon, even when getting a drink of water.

Nehemiah 13:21

13:21 But I warned them and said, “Why do you spend the night by the wall? If you repeat this, I will forcibly remove you!” From that time on they did not show up on the Sabbath.