Cross reference
Leviticus 11:36
36 Nevertheless a fountain or pit, wherein there is plenty of water, shall be clean: but that which toucheth their carcass shall be unclean.
Zechariah 13:1
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
14 But whosoever drinketh of the water that I shall give him shall never thirst; but the water that I shall give him shall be in him a well of water springing up into everlasting life.