مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4299
Musnad of Abdullah bin Mas'ood
It was narrated from Ibn Mas'ood that they said: O Messenger of Allah, how will you recognize those of your ummah whom you have not seen? He said: "They will have shining faces and limbs because of the traces of wudoo'.
Musnad Ahmad 4329Its isnad is hasan]