The Ruling on Narrating Weak Hadiths

Question:
He says: We have heard some scholars say that we are in no need of weak hadiths, whether in rulings, in the virtues of actions, or in encouraging and warning. We have sufficient authentic hadiths, so it is not permissible to narrate weak hadiths except by pointing out their weakness. Is this statement correct?

Answer:
This is what is known about the hadiths. The one who spoke these words is of the same type as the one before him; he did not learn or study. Weak hadiths are not…
…to be rejected all at once, nor is it said that they are never acted upon. Weak hadiths are not all the same. Some have corroborating narrations that strengthen them, making them good (hasan) in themselves. Others are disputed regarding their weakness; some scholars consider them good or authentic, while others consider them weak.
There is no consensus on the weakness of some of them, meaning that every hadith called weak is rejected and left aside. Also, the scholars mentioned that weak hadiths are acted upon in the virtues of actions. They are not used to establish a legal ruling of obligation or prohibition. Rather, they are acted upon only in the virtues of actions that are established by authentic evidence, specifically in encouraging and warning.