It is reported that Imām Al-Zuhrī – Allāh have mercy on him – said:

Those of our scholars who went before us used to say,”Adherence to the Sunnah is salvation, but knowledge is taken away quickly, so the revival of knowledge means the stability of religion and worldly affairs, and the loss of knowledge means the loss of all that.”

Al-Lālakā'ī, Sharh Usūl I’tiqād Ahl Al-Sunnah article 136