“It is better to speak the truth, and lose, than to win by lying.”
Act I, scene II. — (Polinico).
Translation reported in Harbottle's Dictionary of quotations French and Italian (1904), p. 298.
La Calandria (c. 1507)
Original
Egli è meglio perdere, dicendo il vero, che vincere con le bugie.
La Calandria (c. 1507)
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Bernardo Dovizi 13
Italian cardinal and playwright 1470–1520Related quotes

“Alanna didn't approve of lying, but in a pinch a lie was sometimes better than the truth.”
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“Sometimes it is better to lose and do the right thing than to win and do the wrong thing.”
Hansard http://www.publications.parliament.uk/pa/cm200506/cmhansrd/vo051109/debtext/51109-03.htm#51109-03_spmin10, House of Commons, 6th series, vol. 439, col. 302.
9 November 2005, responding to Charles Kennedy in the House of Commons during Prime Minister's Questions. Blair was referring to the likely defeat in Parliament of additional powers to detain terror suspects without charge, which happened later that day.
2000s

“First stop lying, then start speaking the truth.”
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“Here, southlander, you can't quit while you are winning. Better than when I'm losing.”
Man in Fal Dara and Matrim Cauthon
(15 November 1990)

Other

Twitter post http://www.examiner.com/article/lindsey-graham-better-for-a-democrat-to-win-the-white-house-than-donald-trump (August 2015)
2010s

Source: Father and Child Reunion (2001), p. 187.