water and wells, are also very important in Celtic faiths, Galdriels mirror and
the river that washes away weariness (nimrodel?) I'm not sure if that is
an old of a belief as what you are looking for though?
But then again you have the Catholic faith of baptism, and holy water also
I love the way Tolkien is able to use these elements of what we might call
faith or magic, in Middle Earth feel as natural as growing flower, while the
ordinary such as Sam's star can fill us with hope and
wonder.

"ALL SHALL LOVE ME AND DESPAIR!"