John Trapp on Isaiah 49:12-13

Ver. 12. Behold, theſe ſhall come from far] The Jews from all parts, whither they have been diſperſed: the Elect from all quarters of the earth, Mat. 8.11. with the Notes.

And theſe from the land of Sini] Or, of the Sinites, that is of the Chinois (ſaith Junius and others) whom the Greek Geographers call Sinois, Arias Mont. Oſorim. A Lapide. Mr. Cotton. a very populous Nation. Botterus ſaith, that there are reckoned ſeventy millions of men, which are more than are to be found in all Europe: and who knows but many of thoſe of the ten tribes of Iſrael are there?

Enthuſiaſtico jubilo, &c. Oecolamp. Ver. 13. Sing O heaven] The Prophet having thus foretold the Saints happineſs in and by Chriſt, cannot hold but breaketh forth into Gods praiſes, calling into conſort all creatures, which ſince the Fall have lain bed-ridden, as it were looking with ſtretcht-out neck for their full deliverance, Rom. 8.23.

For the Lord hath comforted his people] This is juſt matter of general joy.