Wikipedia
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…But if Brigit belonged to the east, it is not in the west she is forgotten, and the people of Burren and of Corcomruadh and Kinvara go every year to her blessed well that is near the sea, praying and remembering her. And in that well there is a little fish that is seen every seven years, and whoever sees that fish is cured of every disease. And there is a woman living yet that is poor and old and that saw that blessed fish, and this is the way she tells the story:
“I had a pearl in my eye one time, and I went to Saint Brigit’s well on the cliffs. Scores of people there were in it, looking for cures, and some got them and some did not get them. And I went down the four steps to the well and I was looking into it, and I saw a little fish no longer than your finger coming from a stone under the water. Three spots it had on the one side and three on the other side, red spots and a little green with the red, and it was very civil coming hither to me and very pleasant wagging its tail. And it stopped and looked up at me and gave three wags of its back, and walked off again and went in under the rock…