Muhammad bin Abi al-Mujalid said: The people of the mosque sent me to Ibn Abi Awfa (may Allah be pleased with him) to ask him what the Prophet (peace and blessings be upon him) did with the food of Khaybar. So I came to him and asked him about it, and I said: "Was the one-fifth (khumus) taken from it?" He said: "No, because it was less than that, and we would take from it according to our need."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17997