Numbers 9:19

19 And it shall be, whenever the cloud overshadows the tabernacle a number of days, they shall encamp by the word of the Lord, and shall remove by the command of the Lord.

Numbers 9:19 In-Context

17 And when the cloud went up from the tabernacle, then after that the children of Israel departed; and in whatever place the cloud rested, there the children of Israel encamped.
18 The children of Israel shall encamp by the command of the Lord, and by the command of the Lord they shall remove: all the days in which the cloud overshadows the tabernacle, the children of Israel shall encamp. And whenever the cloud shall be drawn over the tabernacle for many days, then the children of Israel shall keep the charge of God, and they shall not remove.
19 And it shall be, whenever the cloud overshadows the tabernacle a number of days, they shall encamp by the word of the Lord, and shall remove by the command of the Lord.
20 And it shall come to pass, whenever the cloud shall remain from the evening till the morning, and in the morning the cloud shall go up, then shall they remove by day or by night.
21 When the cloud continues a full month overshadowing the tabernacle, the children of Israel shall encamp, and shall not depart.

Footnotes 1

The Brenton translation of the Septuagint is in the public domain.