He — This just and merciful man shall enter into a state of rest, where he shall be out of the reach of the approaching miseries. They — just men. Here is a sudden change of the number, which is very frequent in the prophets. Beds — In their graves, which are not unfitly called their beds, as their death is commonly called sleep in scripture.
Related Commentaries of Isaiah 57:2
Isaiah 57:2
2 He shall enter into peace: they shall rest in their beds, each one walking in his uprightness.