Musnad Ahmad 30:333

Rab'i ibn Ibrahim—who is the brother of Isma'il ibn Ibrahim, meaning Ibn 'Ulayyah, and he was considered superior to his brother—narrated to us, from 'Abd al-Rahman ibn Ishaq, from Sa'id ibn Abi Sa'id, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "May the nose of a man be rubbed in the dust in whose presence I am mentioned, yet he does not send blessings upon me. And may the nose of a man be rubbed in the dust upon whom Ramadan enters, then it passes before he is forgiven. And may the nose of a man be rubbed in the dust whose parents reach old age with him, yet they do not cause him to enter Paradise." Rab'i said: And I do not know it except that he said: "Or one of them."