It is reported that ‘Imrān b. Husayn Allāh be pleased with him was once relating hadīth amongst a group of people, when a man said:
Leave this and give us something from the Book of Allāh. ‘Imrān said, “You are a dunce (stupid). Do you find in the Book of Allāh details of prayer. Do you find in the Book of Allāh details of fasting!? This Qur`ān prescribes those matters, and the Sunnah explains them.”
Al-Harawī, Dham Al-Kalām article 244, et al with various wordings. Source: www.sayingsofthesalaf.net
Imām Sa’īd b. Al-Musayyib – Allāh have mercy on him –
Once saw a man praying more than two rak’ah after sunrise the beginning of Fajr, making many bows and prostrations, and so he forbade him. The man said, “O Abu Muhammad, is Allāh going to punish me for praying?” Sa’īd said, “No, but He will punish you for contradicting the Sunnah.”
Al-Bayhaqī, As-Sunan Al-Kubraa 2:466. graded sahīh by Shaykh Al-Albānī. See Irwā Al-Ghalīl 2:236. Source: www.sayingsofthesalaf.net
It is reported that Ishāq b. Rāhuway – Allāh have mercy on him – said:
If you ask the ignorant: ‘Who are Al-Sawād Al-Aʿẓam (Main Body of the Muslims)?’ they will say, ‘All the people (together).’ But they do not know that The Jamā’ah (Main Body) is a scholar who follows the footsteps of the Prophet – Allāh’s praise and peace be upon him – and his way. So whoever is with him and follows him is [one of] The Jamā’ah, but whoever contradicts him in it leaves The Jamā’ah.
Abū Nu’aym, Hilyatu Al-Awliyā` 9:238,239. Source: www.sayingsofthesalaf.net
It is reported that Imām Al-Hasan Al-Basrī – Allāh have mercy on him – said:
To learn a single topic of knowledge and teach it to a Muslim is more beloved to me than having the whole world and giving it in the cause of Allāh.
Al-Khatīb Al-Baghdādī, Al-Faqīh wa Al-Mutafaqqih article 53. Source: www.sayingsofthesalaf.net
It is reported that Abū Muslim Al-Khawlānī – Allāh have mercy on him – said:
The example of the scholars on earth is that of the stars in the sky: when they appear, the people are guided (they navigate using the stars), but when they disappear, the people get confused and lost.
Al-Bayhaqī, Al-Madkhal ilā Al-Sunan Al-Kubrā #287. Source: www.sayingsofthesalaf.net
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. Source: www.sayingsofthesalaf.net