Your thirsty and fainting souls shall be filled with Divine graces and comforts, which you may plentifully draw from God in the use of gospel ordinances, which was oft signified by water, both in the Old and in the New Testament. He seems to allude to the state of Israel in the wilderness, where when they had been tormented with thirst, they were greatly refreshed and delighted with those waters which God so graciously and wonderfully afforded them in that dry and barren land, Numbers 20:11, Numbers 21:16-18.
Related Commentaries of Isaiah 12:3
Isaiah 12:3
3 Therefore with joy shall ye draw water out of the wells of salvation.