With regards to the excellence of the people of knowledge, the Shaykh Abdur-Rahmaan as Sa’dee mentions about the aayah:
<<Allah bears witness that none has the right to be worshipped except Him; and the angels and the people of knowledge (also bear witness to this). He maintains His creation with Justice. None has the right to be worshipped except Him, al Azeez, al Hakeem.>>
(Soorah aale ‘Imraan (3) aayah 18)
And in this aayah is (mentioning of) the virtue of knowledge and the people of knowledge – because Allah singled them out with making mention (of them) to the exclusion of other people; and linked their shahaadah (bearing witness) with His shahaadah and His angels’ shahaadah.
And He made their shahaadah to be from the greatest evidences and proofs for His Tawheed and His Religion and His Recompense.
And that it is obligatory for the mukallafeen (those who are Islamically accountable for their actions) to accept this just and truthful shahaadah.
(Tayseer ul Kareem ir Rahmaan of as Sa’dee)