Ilvala and Vatapi Kill Brahmanas by Deception
The daitya Ilvala asks a powerful brahmana for a son equal to Indra. When the brahmana refuses, Ilvala's rage turns into a systematic scheme of vengeance: he cooks his own brother Vatapi, feeds him to brahmanas, then summons Vatapi back from the dead — and Vatapi rips out of their bodies, killing them from within.
There was once a daitya (demon) named Ilvala. He lived in the city of Manimati with his younger brother, Vatapi.
Ilvala went to a brahmana who had great power earned through austerities and made a request: "O illustrious one! Grant me a son who is Indra's equal."
The brahmana refused. He would not give Ilvala a son equal to the king of the gods.
Ilvala became furious. He had a rare power: if he summoned with his words anyone who had gone to Vaivasvata's world — the realm of the dead — that person would regain his body and be seen alive again.
He decided to use this power for vengeance.
Ilvala took his brother Vatapi and changed his form. He cooked him well — prepared him as food. Then he invited a brahmana to eat. The brahmana ate the meal, unaware of what it contained.
When the food had been consumed, Ilvala summoned Vatapi back.
From inside the brahmana's body, Vatapi emerged — smiling, ripping through the brahmana's side. The brahmana died.
Ilvala repeated this again and again. He fed brahmanas with his brother's cooked flesh, summoned Vatapi back, and watched as Vatapi tore through their bodies from within. The evil-minded daitya caused violence to them, over and over, using the same trick each time.
The brahmanas died. Ilvala's rage was satisfied — for a while. Aranyaka Parva, Chapter 391