Matthew Henry Commentary Exodus 40:34-38

"Then the cloud covered the tent of meeting, and the glory of Jehovah filled the tabernacle. And Moses was not able to enter into the tent of meeting, because the cloud abode thereon, and the glory of Jehovah filled the tabernacle. And when the cloud was taken up from over the tabernacle, the children of Israel went onward, throughout all their journeys: but if the cloud was not taken up, then they journeyed not till the day that it was taken up. For the cloud of Jehovah was upon the tabernacle by day, and there was fire therein by night, in the sight of all the house of Israel, throughout all their journeys." — Exodus 40:34-38 (ASV)

The cloud covered the tabernacle even on the clearest day; it was not a cloud which the sun scatters. This cloud was a sign of God's presence, to be seen day and night by all Israel, that they might never again question, "Is the Lord among us, or is he not?" It guided the camp of Israel through the wilderness.

While the cloud rested on the tabernacle, they rested; when it removed, they followed it. The glory of the Lord filled the tabernacle. In light and fire the Shechinah made itself visible: God is Light; our God is a consuming Fire. Yet so dazzling was the light, and so dreadful the fire, that Moses was not able to enter into the tent of the congregation, until the splendor was abated.

But what Moses could not do, our Lord Jesus has done, whom God caused to draw near; and who has invited us to come boldly, even to the mercy-seat. Being taught by the Holy Spirit to follow the example of Christ, as well as to depend upon him, to attend his ordinances, and obey his precepts, we will be kept from losing our way and be led in the midst of the paths of judgment, until we come to heaven, the habitation of his holiness.

BLESSED BE GOD FOR JESUS CHRIST!