'Fountain' in the Bible

Now a fountain of Jacob's was there; Jesus therefore, being wearied with the way he had come, sat just as he was at the fountain. It was about the sixth hour.

The woman said to him, Sir, you have no vessel and the fountain is deep; from where will you get the living water?

Are you greater than our father Jacob who gave us the fountain and took the water of it himself, with his children and his cattle?

but whosoever drinks of the water which I shall give him shall never thirst for ever, but the water which I shall give him shall become in him a fountain of water, springing up into eternal life.