right side vs left side protection

According to this custom, the left hand is considered to be the receiving side for the body and soul, and by wearing the red string on the left wrist, believers receive a vital connection to the protective energies surrounding the tomb of Rachel, carrying her protective energy with them and drawing from it any time there is need.

A red thread is also said to protect babies against the evil eye, and according to folkloric custom it is placed on the pillow upon which a newborn baby is presented for the first time at a viewing by family and friends. In the late 20th century it became the custom to wind a red string around the tomb of the great Matriarch, Rachel, located in the land of Israel, then to cut the string into pieces and give them out to be worn on the left wrist as an effective protection against the evil eye.