Vamana Avatara (वामनावतारः)
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Once in a battle between the celestials and the demons, the celestials were defeated by the demon Bali Raja, the son of Virochana and grandson of Prahlada. As they were driven away from Svarga, devas sought refuge in Hari. At that very moment, Hari was being praised by Sage Kashyapa and his wife Aditi, the mother of the devas. Therefore, Hari became their son Vamana who was dwarf. He then went to the Yajna being performed by Bali and recited the Vedas at his royal gate. Having heard the Vedic chanting, Raja Bali, in spite of being forbidden by Shukracharya (the preceptor of demons), said to Vamana, “Whatever you desire, I shall give you”. And Vamana asked for ‘three feet of space’. Once dana (दानम्) was agreed upon and water was poured on the hands of Vamana signifying the grant of his request, Vamana grew huge and measured the Earth, Netherworld and Svarga with his three strides. He then sent Raja Bali to Sutala and gave the worlds to Indra.
This story is taken from the Agni Purana (Chapter 4).