Psalms 90:1

This psalm is entitled a prayer of Moses. Where, and in what volume, it was preserved from Moses's time till the collection of psalms was begun to be made, is uncertain; but, being divinely inspired, it was under a special protection: perhaps it was written in the book of Jasher, or the book of the wars of the Lord. Moses taught the people of Israel to pray, and put words into their mouths which they might make use of in turning to the Lord. Moses is here called the man of God, because he was a prophet, the father of prophets, and an eminent type of the great prophet. In these verses we are taught, I. To give God the praise of his care concerning his people at all times, and concerning us in our days (Psa 90:1): Lord, thou hast been to us a habitation, or dwelling-place, a refuge or help, in all generations. Now that they had fallen under God's displeasure, and he threatened to abandon them, they plead his former kindnesses to their ancestors. Canaan was a land of pilgrimage to their fathers the patriarchs, who dwelt there in tabernacles; but then God was their habitation, and, wherever they went, they were at home, at rest, in him. Egypt had been a land of bondage to them for many years, but even then God was their refuge; and in him that poor oppressed people lived and were kept in being.

— Matthew Henry's Concise Commentary (public domain)