Ruling on acting upon weak hadiths in matters of virtues?

Question:
Some scholars have stated that weak hadiths may be acted upon in matters of the virtues of deeds. We ask for details on this issue.

Answer:
This is the view of the majority: acting upon a weak hadith that has not reached the level of fabrication or extreme weakness. The meaning of "weak" here is "good" according to al-Tirmidhi, which has corroborating narrations. That is, it was narrated by people in whom there is weakness, such as poor memorization, but it has corroborating narrations. This is the weak hadith.
As for the fabricated and the false, or the narrator who is accused of lying: this is not mentioned even in encouraging good or warning against evil.
However, if it has corroborating narrations, or if the narrator has only slight weakness in it due to poor memorization, then it may be mentioned in encouraging good or warning against evil, though leaving it out is more preferable. People are in need of authentic hadiths, as Muslim (may Allah have mercy on him) said: "People are in need of authentic hadiths." Authentic hadiths and verses are sufficient for encouraging good and warning against evil, praise be to Allah. Therefore, leaving out weak hadiths in encouraging good and warning against evil is more preferable, even if the majority permits it; leaving it out is more preferable. It is better to suffice with authentic hadiths if that is feasible. But if the weak hadith is mentioned as the majority mentioned it—provided it is not fabricated or close to fabrication—there is no blame.