The cloud … was upon the tabernacle by day and fire was on. it by night. Compare Exodus 13:21, Exodus 13:22; and Exodus 14:20, Exodus 14:24; Numbers 9:15, Numbers 9:16. The cloud had two aspects—one obscure, the other radiant. It was a dark column by day—a pillar of fire by night. Thus it was always visible.
HOMILETICS