مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4288
Musnad of Abdullah bin Mas'ood
It was narrated from Ibn Mas'ood (رضي الله عنه) that It was said: O Messenger of Allah, on the Day of Resurrection, 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 4317Saheeh because of corroborating evidence; its isnad is hasan