Albert Barnes Commentary Isaiah 54:2

"Enlarge the place of thy tent, and let them stretch forth the curtains of thy habitations; spare not: lengthen thy cords, and strengthen thy stakes." — Isaiah 54:2 (ASV)

Enlarge the place of your tent - The same idea occurs in Isaiah 49:19-20 (see the notes at that chapter). The curtains of your habitations.

The word ‘curtain’ does not quite express the sense here. It is commonly used among us to denote the cloth hanging around a bed or at a window, which may be spread or drawn aside at pleasure, or the hanging in theaters to conceal the stage from the spectators.

The word here, however, denotes the canopy or cloth used in a tent. The idea is that the boundaries of the church were to be greatly enlarged to accommodate the vast accession from the pagan world.

Spare not - Do not be parsimonious in the provision of the materials for greatly enlarging the tent to dwell in.

Lengthen your cords - (See the note at Isaiah 33:20).