The Great Epic of the Bhārata dynasty 1.57.19

1.57.19

tataḥ prabhṛti cādyāpi yaṣṭyāḥ kṣitipasattamaiḥ |
praveśaḥ kriyate rājanyathā tena pravartitaḥ || 19 ||

"The slayer of Vritra (Indra) also gave the king, for his gratification, a bamboo pole for protecting the honest and the peaceful. After the expiry of a year, the king planted it in the ground for the purpose of worshipping the giver thereof, viz., Sakra. From that time forth, O monarch, all kings, following Vasu's example, began to plant a pole for the celebration of Indra's worship. After erecting the pole they decked it with golden cloth and scents and garlands and various ornaments. And the god Vasava is worshipped in due form with such garlands and ornaments. And the god, for the gratification of the illustrious Vasu, assuming the form of a swan, came himself to accept the worship thus offered. And the god, beholding the auspicious worship thus made by Vasu, that first of monarchs, was delighted, and said unto him, 'Those men, and kings also, who will worship me and joyously observe this festival of mine like the king of Chedi, shall have glory and victory for their countries and kingdom. Their cities also shall expand and be ever in joy.'