Musannaf Ibn Abi Shayba 33:241

'Abdah ibn Sulayman narrated to us, from Mis'ar, from Habib, from Yahya ibn Ja'dah, who said: Umar said: "Were it not for marching in the way of Allah, or placing my forehead in the dust for Allah, or sitting with a people who pick out the best of speech just as dates are picked out, I would have loved to have joined Allah."