Indra, the king of gods and father of Arjuna, disguised himself as a poor Brahmin and approached Karna to beg for his kavacha (armor) and kundala (earrings). This was a strategic move to weaken Karna, who was invincible as long as he wore his divine birth armor. Karna, known for his generosity, gave them away despite knowing the Brahmin's true identity.