Musannaf Ibn Abi Shayba 33:170

Sufyan ibn 'Uyaynah narrated to us, from 'Amr, from Sa'id ibn Jubayr, from Ibn 'Abbas, that he heard the Prophet, may Allah bless him and grant him peace, delivering a sermon while he was saying: "Indeed, you will meet Allah walking, barefoot, naked, and uncircumcised."