Authors:

Set me as a seal upon thine heart, as a seal upon thine arm: for love is strong as death.

Cassandra Clare (2012). “Cassandra Clare: The Mortal Instruments Series (5 books): City of Bones; City of Ashes; City of Glass; City of Fallen Angels, City of Lost Souls”, p.1613, Simon and Schuster
Set me as a seal upon thine heart, as a seal upon thine arm: for love is strong as death.