In that day there shall be a fountain opened - This chapter is a continuation of the preceding, and should not have been separated from it.
A fountain - The source of mercy in Christ Jesus; perhaps referring to the death he should die, and the piercing of his side, when blood and water issued out.
To the house of David - To David's family, and such like persons as it included. See the history of David and his sons, and then learn for whom Christ shed his blood.
Inhabitants of Jerusalem - Such like persons as the Jews were in every part of their history, and in their last times, when they clamoured for the blood of Christ, and pursued him unto death! Learn from this also for whom Christ died! These were the worst of the human race; and if he died for them, none need despair. They rejected, betrayed, crucified, slew, and blasphemed Christ, and afterwards persecuted his followers. For these he died! Yes: and he tasted death for Every Man.
For sin and for uncleanness - For the removal of the guilt of sin, and for the purification of the soul from the uncleanness or pollution of sin.