Makhul (may Allah have mercy on him) said: I was a slave in Egypt belonging to a woman of Hudhayl, and she freed me. I did not leave Egypt until I had acquired its knowledge; then I came to Syria.
Then I asked about the spoils (nafl), but I found no one who could tell me anything about it, until I met Shaykh Ziyad bin Jariyah (may Allah have mercy on him). I said to him: Have you heard anything about the spoils (nafl)? He said: Yes, I heard Habib bin Maslamah (may Allah be pleased with him) say: I was present with the Messenger of Allah (peace and blessings be upon him) when he (peace and blessings be upon him) "gave a quarter at the beginning (of the expedition) and a third on the return."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 12799