Leviticus 11:36

Nevertheless a spring or a cistern in which water is a gathered shall be clean: but that which touches their carcass shall be unclean.

Zechariah 13:1

"In that day there will be a spring 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 never thirst again; 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 will be a spring 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 never thirst again; but the water that I will give him will become in him a well of water springing up to eternal life."