Whose forehead was as hard as adamant and harder than flint?

0 Whose forehead was as hard as adamant and harder than flint?

The father shall be divided against the son, and the son against the father; the mother against the daughter, and the daughter against the mother; the mother in law against her daughter in law, and the daughter in law against her mother in law. Luke 12:53

Trivia: Who said that even the devils obey them?

The Bhagavad
Gita