The Jews might have used the hamsa to invoke the hand of God, or to counteract the Evil Eye.
The hamsa hand can be facing up or down and is thought to give the owner success, harmony, and also protection from the “ayin ha’ra” or evil eye.
Today, with the rising popularity of Kabbalah and spiritual Judaism, the hamsa hand has become increasingly more widespread.
Many Jews believe that the five fingers of the hamsa hand remind its wearer to use their five senses to praise God!!