The origin of the proverb "fish and guests smell after three days" is commonly attributed to Benjamin Franklin, who included a version of it in his 'Poor Richard's Almanack' in 1736, however, the sentiment has appeared in various forms across cultures. The proverb highlights the importance of moderation in hospitality, emphasizing that prolonged visits can lead to discomfort or strained relationships. It serves as a reminder that both guests and hosts should be mindful of time and space to maintain positive interactions.