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In this article the proverbs and maxims that are used in Arabic and Persian language in common are studied. Then we consider the proverb briefly. Also we point out the Quranic proverbs and philosophy that Sadi has used in his works. In this article the poetical proverbs that Motenabbi has used in his work and influenced on Sadi have been stated. Finally we conclude that, because these two poets were living in an Islamic environment and training in Islamic culture, they have used so many proverbs in common.