It wasnarrated from 'Ubadah bin Samit that the Prophet (ﷺ) awardedonequarter of the spoils to those who attacked the enemy at thebeginning and one third to those who attacked at the end. (FR)
English reference (FR): Vol. 4, Book 24, Hadith 2852 (FR)
Arabic reference (FR): Book 24, Hadith 2960 (FR)