“Maveli naadu vaneedum kaalam: manushar ellarum onnu pole.” ( in English, “In the days when Maveli reigned, all humans were as one, and were treated alike.”)
Mahabali was highly regarded by his subjects and everybody was happy in his kingdom. Gods felt challenged with the growing popularity of Mahabali. They seeked help from Lord Vishnu who was worshiped by King Mahabali. Lord Vishnu took the avatar of a poor and dwarf Brahmin, called Vamana and came kingdom of Mahabali just after his morning prayers, when the King gave boons to the Brahmin.to the kingdom of Mahabali just after his morning prayers, when the King gave boons to the Brahmin.
Disguised as Vamana, Vishnu said he was a poor Brahmin and asked for a piece of land. The generous King said, he could have as much land as he wanted. The Brahmin said that he just wanted as much land as could be covered by his three steps . The King was surprised to hear but agreed.

A learned adviser of the King, Shukracharya sensed that Vamana was not an ordinary person and warned the King against making the promise. But, the generous King replied that it would be a sin for a King to back on his words and asked the Brahmin to take the land. The King could not imagine that the dwarf Brahmin was Lord Vishnu himself.

Just as King Mahabali agreed to grant the land, Vamana began to expand and eventually increased himself to the size of cosmic proportions. With his first step the Brahmin boy covered the whole of earth and with the other step he covered the whole of the skies. He then asked King Mahabali where is the space for him to keep his third foot.

The King realised that he was no ordinary Brahmin and his third step will destroy the earth. Mahabali with folded hands bowed before Vamana and asked him to place his last step on his head so that he could keep the promise. The Brahmin placed his foot on the head of the King, which pushed him to patala , the nether world. There the King requested the Brahmin to reveal his true identity. Lord Vishnu then appeared before the King in his person. The Lord told the King that he came to test him and the King won the test. King Mahabali was pleased to see his lord. Lord Vishnu also granted a boon to the King.
The King was so much attached with his Kingdom and people that he requested that he be allowed to visit Kerala once in a year. Lord Vishnu was moved by the Kings nobility and was pleased to grant the wish. He also blessed the King and said even after losing all his worldly possessions, the King would always be loved by Lord Vishnu and his people.