That is how it continued to be; the cloud covered it, and at night it looked like fire.
Read Numbers 9:16 Using Other Translations
So it was alway: the cloud covered it by day, and the appearance of fire by night.
So it was always: the cloud covered it by day and the appearance of fire by night.
This was the regular pattern—at night the cloud that covered the Tabernacle had the appearance of fire.
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(New International Version Bible Online)