Vamana grew to an enormous size and covered everything Mahabali ruled over in just two paces. For the third pace, Mahabali offered his head for Vishnu to step on, an act that Vishnu accepted as evidence of Mahabali's devotion. Vishnu granted him a boon, by which Mahabali could visit again, once every year, the lands and people he previously ruled. This revisit marks the festival of Onam, as a reminder of the virtuous rule and his humility in keeping his promise before Vishnu. The last day of Mahabali's stay is remembered with a nine-course vegetarian Onasadya feast.