مختصر صحيح بخاري
Mukhtasar Sahih Bukhari
Book of Obligation of Khums (One-Fifth)
Prophet giving from the fifth to new and old Muslims as he wished.
Sayyiduna Anas (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) once said: "I give (wealth) to the Quraysh (those who have newly embraced Islam) in order to win their hearts, because they are still close to the period of ignorance."