In the Brahmanda Purana it is said, "A person who sees the Lord's Ratha-yatra car festival and then stands up to receive the Lord can purge all kinds of sinful results from his body."

A similar statement is there in the Bhavisya Purana, in which it is said, "Even if born of a lowly family, a person who follows the Ratha-yatra car when the Deities pass in front or from behind will surely be elevated to the position of achieving equal opulence with Visnu."

From NoD ch. 9