John Trapp on Isaiah 51:3

Ver. 3. For the Lord ſhall comfort Zion] (As once he did Abraham) by multiplying her children, giving her in good ſtore of Converts: theſe were the Apoſtles and the Primitive Chriſtians, thoſe earthly Angels, who made the world (which before was as a waſte wilderneſſe) to become a moſt pleaſant and plentiful Paradiſe. Chryſoſtom ſomewhere calleth them Angels, and ſaith that they were puriores coel[illegible: 1 letter] afflictione facti, more clear then the azured sky.

Joy and gladneſſe ſhall be found in them] See chap. 35.10.

Thanksgiving and the voice of melody] Paul as the Pracentor ſweetly ſings and gives the Note to us all, Eph. 1, 3, 4, 5. &c. Bleſſed be the God and Father of our Lord Jeſus Chriſt who hath bleſſed us, &c.