John Trapp on Isaiah 50:3

Ver. 3. I clothe the heavens with blackneſſe] I did ſo in that three-daie darkneſs in Egypt, Exod. 10.21, 22. and ſhall do ſo again at the time of my Paſſion: I can therefore, doubtleſs deliver you not only from Babylon, but from ſin, death, and hell, by giving you an entrance into Heaven by the waters of Baptiſm, and by bringing you out of darkneſs into my marvelous light, 1 Pet. 2.9.

And make ſack-cloth their covering] Ita ut coelum pullata veſte obtenſum fuiſſe dixeris. So Rev 6.12.