Because they dwelt in tents, Abraham could say of his people "eternity was our covering and our rock and our salvation." The rock and the salvation are the Worship of the Shalems and the Day of Atonement. "Covering" is one way to understand the Hebrew root underlying the word we translate as "atone," "atonement." "Eternity" is 'olam, the world, the cosmos, that which endures forever with God.
All this because they dwelt in tents. What kinds of tents were these? Were they the tents of the people of Shum?