A Muslim is enjoined to be honest and truthful in all situations, including buying and selling. Sales transactions should be based on clarity and honesty about the merits and flaws of the commodity, to eliminate all chances of cheating, which sows hatred and discord among people. In this hadeeth, the Taabi’ee (a Muslim who saw at least one of the Companions) ‘Amr ibn Dinaar stated that ‘AbdullahIbn ‘Umar (may Allah be pleased with him) bought camels from a man named Nawwaas and that these camels were infected with a disease known as Hiyaam, making their thirst excessive and unquenchable. It may also refer to a disease that resulted in scabies. It was also said that Al-Heem are thescabby camels painted with tar, and which therefore become thirsty due to the higher body temperature caused by it. Ibn ‘Umar (may Allah be pleased with him) bought these camels from a partner of Nawaaas, and this partner went to Nawwaas and informed him of the sale.He asked him: “To whom have you sold them?” The partner described the buyer to him, and Nawwaas knew that he was Ibn ‘Umar (may Allah be pleased with him).He said to him: “Woe to you! By Allah, that Shaykh was Ibn ‘Umar.” The Arabic word used in the hadeeth is ‘Wayhaka,’ which literally means ‘woe to you,’ indicating rebuke, and it is said in reference to someone who has made a serious mistake. Nawwaas went to Ibn ‘Umar and informed him that his partner had sold him some sick camels without informing him of their flaws prior to the sale. Ibn ‘Umar (may Allah be pleased with him) asked him to take them back, given the circumstances. When Nawwaas went to take them, Ibn ‘Umar (may Allah be pleased with him) said to him, “Leave them there; I am happy with the judgment of Allah's Messenger ﷺ that there is no ‘Adwa (i.e., contagion and transmission of infectious disease without the permission of Allah),” meaning that he (may Allah be pleased with him) did so in compliance with the Prophet’s statement, ‘There is no ‘Adwaa.’ The Arabic word used in the hadeeth (‘Adwaa) means contagion and transmission of infectious disease from one patient to another. The Prophet’s statement means that diseases cannot cause infection by themselves without the permission and decree of Allah, Exalted is He.People of the pre-Islamic era believed that diseases could spread from one person to another without the permission of Allah. The Prophet ﷺ negated that false belief and clarified to them that diseases are mere causes that may only have effects by the decree and permission of Allah, who causes illness (and that contagion is a means through which Allah effects His decrees). The hadeeth highlights the virtues of Ibn ‘Umar (may Allah be pleased with him), and his (remarkable) compliance with the Prophet’s guidance and judgments, even if it seemed to be harmful. It is also deduced from the hadeeth that a sale of a defective commodity is valid as long as the buyer is informed of its flaws and gives his consent. It is also inferred therefrom that a buyer may return a defective commodity (and annul the transaction) if its defect was concealed by the seller. .