Isaiah 40:1

We have here the commission and instructions given, not to this prophet only, but, with him, to all the Lord's prophets, nay, and to all Christ's ministers, to proclaim comfort to God's people. 1. This did not only warrant, but enjoin, this prophet himself to encourage the good people who lived in his own time, who could not but have very melancholy apprehensions of things when they saw Judah and Jerusalem by their daring impieties ripening apace for ruin, and God in his providence hastening ruin upon them. Let them be sure that, notwithstanding all this, God had mercy in store for them. 2. It was especially a direction to the prophets that should live in the time of captivity, when Jerusalem was in ruins; they must encourage the captives to hope for enlargement in due time. 3. Gospel ministers, being employed by the blessed Spirit as comforters, and as helpers of the joy of Christians, are here put in mind of their business. Here we have, I. Comfortable words directed to God's people in general, Isa 40:1.

— Matthew Henry's Concise Commentary (public domain)