It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that there was a man from the Quraysh whom people used to deceive in trade. This was mentioned before the Prophet (peace and blessings be upon him), so the Prophet (peace and blessings be upon him) said: "Whenever you buy or sell with someone, say to him: 'There is no deception in this transaction.'" Since he had a stammer in his speech, instead of saying «لاخلابه» , he would say «لاخيابه» .