Matthew Poole and continuators on Isaiah 50:3

3 I cloath the heavens with blackness , and I make sackcloth their covering .

Or, I will or can cloath, &c. What I once did in Egypt, when I drew black curtains before all the heavenly Lights, and caused an unparallel'd and amazing Darkness for three days together, to the great terrour of mine Enemies, so I can and will do still when it is necessary to save my People. And therefore you have no reason to distrust me.

I cover them with thick and dark Clouds black as Sackcloath, as is said, Rev. 6. 12. or as that stuff of which the Tents of Kedar were made, Cant. 1. 5. From this and some other Expressions it appears, that they wore a black sackcloth, which also was most sutable to the state of mourners, by whom it was used.