Isaiah 44:3:

For I will pour water on the thirsty land,
and streams on the dry ground;
I will pour my Spirit upon your offspring,
and my blessing on your descendants.

Calvin:

“We ought always to keep in remembrance that these prophecies relate to that sorrowful and afflicted period of which he formerly spoke, that is, when the people, in the extremity to which they were reduced, might think that they were altogether forsaken, and that all the promises of God were vain. Isaiah meets this doubt, and compares the people to a dry and thirsty land, which has no moisture at all. By this metaphor David also describes his wretchedness. (Psalm 143:6.) Although therefore they were worn out by afflictions, and the vital moisture was decayed, yet, that they might not throw away courage in their deepest distresses, they ought to have set before their minds this declaration of the Prophet. We, too, when we are brought into the greatest dangers, and see nothing before us but immediate death, ought in the same manner to betake ourselves to these promises, that we may be supported by them against all temptations. Yet we must feel our drought and poverty, that our thirsty souls may partake of this refreshing influence of the waters.“