“Fish and guests in three days are stale.”
Source: Asinaria (The One With the Asses), Act I, scene 3. http://books.google.com/books?id=fo0QAAAAIAAJ&q=%22Quasi+piscis+itidem+est+amator+lenae+nequam+est+nisi+recens%22&pg=PA63#v=onepage
Original
Quasi piscis itidem est amator lenae: nequam est nisi recens.
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Plautus 54
Roman comic playwright of the Old Latin period -254–-184 BCRelated quotes

“1544. Fish and Guests smell at three Days old.”
Compare Poor Richard's Almanack (1736) : Fish & Visitors stink in 3 days.
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)

“Fish and visitors stink in three days.”
Adapted 16th century writer John Lyly's line http://www.todayifoundout.com/index.php/2015/03/ben-franklins-best-epigrams/ found in Euphues – the Anatomy of Wit: Fish and guests in three days are stale.
Attributed

“There are three things that smell of fish. One of them is fish. The other two are growing on you!”
"Jumbo Go Away".
You Are What You Is (1981)

“For a guest remembers all his days the hospitable man who showed him kindness.”
XV. 54–55 (tr. G. H. Palmer).
Odyssey (c. 725 BC)

“Sell a man a fish and he will eat for a day. Teach a man to fish and he will put you out of a job.”
Ron English's Fauxlosophy (2016)

This quotation has been misattributed to Laozi; its origin is actually unknown (see "give a man a fish and you feed him for a day; teach a man to fish and you feed him for a lifetime" on Wiktionary). This quotation has also been misattributed to Confucius and Guan Zhong.
Misattributed