AbstractAl-Fārābī's lost commentary on Aristotle's Ethica Nicomachea is without doubt one of the most sorely missed lost works of the Islamic falāsifa. In part, this is because the commentary was in some respects a scandal, and scholars accordingly believe it may hold the key to resolving present-day disagreements on how to interpret al-Fārābī's views as expressed in his independent treatises. Perhaps al-Fārābī's most shocking or scandalous statement is that preserved by the Hispano-Muslim philosophers Ibn Bājja, Ibn Ṭufayl, and Ibn Rushd. According to them al-Fārābī says in his commentary on Aristotle's Ethica Nicomachea that happiness is to be achieved only in this life, not in the afterlife; that there is no happiness but political happiness; and that union with the active intellect – generally considered the highest goal of human existence by the philosophers – is impossible. This paper addresses the following questions: What exactly is the debate about? Why is the question of immortality or conjunction related to Aristotle's Ethica Nicomachea? And why was it so controversial to say, in the context of the Ethica Nicomachea, that there is no happiness but political happiness? Although the bulk of al-Fārābī's commentary is still lost, I have discovered two quotations of it in Hebrew manuscripts. As I will argue in this paper, these newly-discovered quotations – which are included with an English translation in the appendix – can shed light on the mysteries concerning al-Fārābī's commentary.