Musannaf Ibn Abi Shayba 28:975

'Isa ibn Yunus narrated to us, from 'Amr, the freed slave of Ghafra, who said: I intended to go on a military expedition, so I prepared myself with what I had in my possession. A man sent me aid of sixty dinars for the sake of Allah. He said: So I came to Sa'id ibn al-Musayyib and mentioned that to him, and I said, "Should I leave for my family the equivalent of what I spent?" He said, "No, but when you reach the head of the expedition, it is like the status of your own wealth." Then I came to al-Qasim ibn Muhammad and mentioned that to him, and he said to me the same as what Sa'id ibn al-Musayyib said.