Bede

And David and his men went up, etc. Upon the rock, Egypt sounds darkness. Therefore, the Church was growing through the steadfastness of Christ's disciples, and was rescuing souls from pagan rites, which, following the examples of not new but ancient men, had clung to earthly desires, with all going to the hardness of heart, and arriving as far as the dark land, covered with the gloom of death, the land of the misery of darkness, where the shadow of death, and no order, and eternal horror dwells.

Commentary on Samuel ↗