Tariq bin Shihab al-Ahmasi (may Allah be pleased with him) says that Umar bin al-Khattab (may Allah be pleased with him) wrote: "The spoils belong to those who were present at the battle."
This is the authentic report from Umar (may Allah be pleased with him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17954