Musnad Abu Ya'la al-Mawsili 3:263

Suwayd ibn Sa'id narrated to us, Habib ibn Habib—the brother of Hamzah al-Zayyat—narrated to us, from Abu Ishaq, from al-Harith, from Ali, from the Prophet, peace and blessings of Allah be upon him, who said: "Islam is eight shares: Islam is a share, prayer is a share, zakat is a share, Hajj is a share, jihad is a share, fasting Ramadan is a share, enjoining good is a share, and forbidding evil is a share. And he who has no share is ruined."