It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) passed by some people in Makkah, and they began making signs (of mockery) behind his (peace and blessings be upon him) back and saying: "This is the one who claims that he is a prophet." At that time Jibril (peace be upon him) was with him (peace and blessings be upon him). So Jibril (peace be upon him) pointed with his finger, and something like the mark of a fingernail appeared on their bodies, which then turned into sores, until those people rotted and stank, and no one could bring himself to go near them. Then Allah Almighty revealed this verse: "Indeed, We are sufficient for you against the mockers."
No one narrated this hadith from Sayyiduna Anas (may Allah be pleased with him) except Yazid bin Dirham (may Allah have mercy on him), and Muhammad bin Uthman al-Qurashi (may Allah have mercy on him) is alone in narrating it.
Hadith Referenceالمعجم الأوسط / باب الميم / 7127
Hadith Takhrij«أخرجه البزار فى «مسنده» برقم: 7368»