Leviticus 11:36

Notwithstanding, a fountain or cistern wherein is a gathering of waters shall be clean, - but, he that toucheth the carcase of them shall be unclean.

Zechariah 13:1

In that day, there shall be an opened fountain, for the house of David, and for the Inhabitants of Jerusalem, - for sin and for uncleanness.

John 4:14

But, whosoever shall drink of the water which, I, will give him, in nowise shall thirst, unto times age-abiding, - but, the water which I will give him, shall become, within him, a fountain of water, springing up unto life age-abiding.

Treasury of Scripture Knowledge

Summary

Nevertheless a fountain or pit, wherein there is plenty of water, shall be clean: but that which toucheth their carcase shall be unclean.

Bible References

A fountain

Zechariah 13:1
In that day, there shall be an opened fountain, for the house of David, and for the Inhabitants of Jerusalem, - for sin and for uncleanness.
John 4:14
But, whosoever shall drink of the water which, I, will give him, in nowise shall thirst, unto times age-abiding, - but, the water which I will give him, shall become, within him, a fountain of water, springing up unto life age-abiding.