Myrrh, an exotic Biblical spice - was given to the Baby Jesus as a gift from the Wise Men. It was used in purification & beautification rites, in the formula for the Holy Anointing Oil, and in burial spices.
In the biblical book of Esther, you can read how Queen Esther was bathed in Oil of Myrrh for six months and with other aloes and perfumes for another six months before her presentation to the king. Sweet to the smell - but bitter to taste, myrrh in the spiritual sense speaks of dying to self to become a "sweet smelling savor" to the Lord.
Esther 2:12: ”...according to the regulations for the women, for thus were the days of their preparation apportioned: six months with oil of myrrh, and six months with perfumes and preparations for beautifying women.”