This hadith has been narrated on the authority of 'Abdullah b. Dinar with the same chain of transmitters but these words are not found in it." When he buys he should say:
There should be no attempt to deceive."
Reference: Sahih Muslim 1533 b In-book : Book 21, Hadith 60 USC-MSA web (English) : Book 10, Hadith 3664 (deprecated)
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