Leviticus 11:36

Only -- a fountain or pit, a collection of water, is clean, but that which is coming against their carcase is unclean;

Zechariah 13:1

In that day there is a fountain opened To the house of David And to the inhabitants of Jerusalem, For sin and for impurity.

John 4:14

but whoever may drink of the water that I will give him, may not thirst -- to the age; and the water that I will give him shall become in him a well of water, springing up to life age-during.'

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 is a fountain opened To the house of David And to the inhabitants of Jerusalem, For sin and for impurity.
John 4:14
but whoever may drink of the water that I will give him, may not thirst -- to the age; and the water that I will give him shall become in him a well of water, springing up to life age-during.'