Our Lord! Send amongst them a Messenger of their own, who shall recite unto them Your verses and instruct them in the Book (this Qur`ân) and Al-Hikmah (wisdom) and sanctify them. Verily! You are the All-Mighty, the All-Wise.” [Al-Baqarah 2:129]
And remember (O members of the Prophet’s family) that which is recited in your houses of the Verses of Allâh and Al-Hikmah. [Al-Ahzab 33:34]
It is reported that Al-Hasan Al-Basrî – Allâh have mercy on him said, “Al-Kitâb is the Qur`ân, and Al-Hikmah is the Sunnah.”
It is also reported that Qatâdah – Allâh have mercy on him said, “And [he will] teach them The Book and Al-Hikmah, i.e. the Sunnah.”
Al-Lâlakâ`î, Sharh Usûl I’tiqâd Ahl Al-Sunnah wa Al-Jamâ’ah Vol.1 p86, 87; Ibn Battah, Al-Ibânah Al-Kubrâ Vol.1 p98; and Al-Tabarî in his Tafsîr.
Shaykh Al-Islâm Ibn Taymîyah said (Majmû’ Al-Fatâwâ Vol.3 p366), “A number of the Salaf said that Al-Hikmah refers to the Sunnah, because that which was recited in the houses of [the Prophet’s] wives – Allâh be pleased with them – apart from the Qur`ân was his Sunnah – Allâh’s peace and blessings be upon him.”