Musnad Ahmad 1302:1

'Ali ibn Thabit narrated to us, Hisham ibn Sa'd narrated to me, from Hatim ibn Abi Nasr, from 'Ubadah ibn Nusayy, who said: There was a man in the Levant called Ma'dan. Abu al-Darda' used to teach him the Qur'an. Abu al-Darda' missed him, then met him one day while he was in Dabiq. Abu al-Darda' said to him: "O Ma'dan, what has become of the Qur'an that was with you? How are you and the Qur'an today?" He said: "Allah knows of it, and He has made it good." He said: "O Ma'dan, do you live in a city today or in a village?" He said: "No, rather in a village near the city." He said: "Slow down, woe to you, O Ma'dan! For I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: 'There are no five people in a household in whom the prayer is not called and the prayers are not established, except that the devil has overcome them. And the wolf only takes the stray sheep.' So, you must stick to the cities, woe to you, O Ma'dan."