Project Moksha Quiz 8 - Lord Hanuman Series
The weapon Vajra - The thunderbolt used by Indra, the king of gods, damaged Hanuman's jaw.
According to the scriptures, Hanuman, as a child, mistook the sun for a fruit and attempted to eat it. Indra intervened and struck Hanuman with his thunderbolt, hitting him on the jaw and sending him falling back to the ground.