Leviticus 11:36

Nevertheless a fountain or a pit in which is a gathering of water shall be clean, but that which touches their carcass shall be unclean.

Zechariah 13:1

In that day there shall be a fountain opened to the house of David and to the inhabitants of Jerusalem, for sin and for uncleanness.

John 4:14

but whoever drinks of the water that I will give him will, no, not thirst into the age. But the water that I will give him will become in him a well of water springing up to eternal life.

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 a fountain opened to the house of David and to the inhabitants of Jerusalem, for sin and for uncleanness.
John 4:14
but whoever drinks of the water that I will give him will, no, not thirst into the age. But the water that I will give him will become in him a well of water springing up to eternal life.