Hadith: A saying of the Prophet transmitted outside the Qur'an through a chain of known intermediaries. There are two kinds of hadith: hadith qudsi (sacred sentence), a direct revelation, in which God speaks in the first person by the mouth of the Prophet, and hadith nabawi (prophetic sentence), an indirect revelation in which the Prophet speaks as himself.
Source: The Spiritual Writings of 'Abd al-Kader, 1995,4, pp. 37-38 and Introduction to Sufism, p. 117
Contributed by: Zaady