Musannaf Ibn Abi Shayba 33:147

Husayn ibn Ali and Abu Usamah narrated to us, from Za'idah, from Abd al-Malik ibn Umayr, from Rib'i, from Umm Salamah, who said: The Messenger of Allah, may Allah bless him and grant him peace, entered upon me while his face was pale. I thought that was due to some change [in his health], so I said, "O Messenger of Allah, I see your face is pale; is it from an illness?" He said, "No, but the seven dinars that were brought to us yesterday, I forgot them in the fold of the mattress, and I spent the night without distributing them."