It is reported that Al-Ḥasan Al-Baṣrī – Allāh have mercy on him – said:
People will remain upon good as long as they vary (some are more knowledgeable, righteous etc); when they become equal, that is when they are destroyed.
Al-Bayhaqī, Shuʿab Al-Īmān #8664 (Al-Rushd ed.).
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It is reported that Al-Ḥasan Al-Baṣrī – Allāh have mercy on him – said: One who acts without knowledge is like one who travels off the path; and the one who acts without knowledge corrupts more than he rectifies. So seek knowledge in a way that does not harm your worship, and seek to worship […]
The importance of knowing what spoils good deeds, just like knowing how to do good deeds.
Another prohibition from the Salaf against sitting and debating with the people of bid’ah.