Musnad Ahmad 1078:2

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from al-Zuhri, from 'Ata' ibn Yazid al-Laythi, from 'Ubayd Allah ibn 'Adi ibn al-Khiyar, from 'Abd Allah ibn 'Adi al-Ansari, that he narrated to him that the Messenger of Allah (may Allah bless him and grant him peace) was sitting when a man came to him, meaning he was asking his permission to whisper to him, and he mentioned its meaning.