Musnad Ahmad 27:1751

Musa ibn Dawud narrated to us, Abd al-Aziz ibn Abi Salamah narrated to us, from Abdullah ibn Dinar, from Ibn Umar, who said: The Prophet, peace and blessings be upon him, said while he was in the Hijr: "Do not enter upon these people who are being punished, unless you are weeping, lest there befall you the like of what befell them."