Sahih Bukhari | Volume 5 | Hadith Number 537

Narrated by Ibn 'Umar
On the day of Khaibar, Allah's Apostle divided (the war booty of Khaibar) with the ratio of two shares for the horse and one-share for the foot soldier. (The sub-narrator, Nafi' explained this, saying, "If a man had a horse, he was given three shares and if he had no horse, then he was given one share.")