Cross reference
Leviticus 11:36
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
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
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."