Leviticus 11:36

However, a spring or a cistern which collects water will be clean, but one who touches their carcass will be unclean.

Zechariah 13:1

"In that day there will be a fountain opened up for the dynasty of David and the people of Jerusalem to cleanse them from sin and impurity.

John 4:14

But whoever drinks some of the water that I will give him will never be thirsty again, but the water that I will give him will become in him a fountain 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 fountain opened up for the dynasty of David and the people of Jerusalem to cleanse them from sin and impurity.
John 4:14
But whoever drinks some of the water that I will give him will never be thirsty again, but the water that I will give him will become in him a fountain of water springing up to eternal life."

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