There is a rule that states: weak hadiths are accepted in matters of the virtues of actions. I ask you to clarify the validity of this rule with some detail.

The questioner : There is a rule that states: weak hadiths are accepted in matters of the virtues of actions. I ask you to clarify the validity of this rule with some detail, if possible.

The Shaykh : This—may Allah bless you—is possible, but it is better for the one who is concerned with the matter to refer to my introduction to "Sahih al-Targhib wa al-Tarhib." However, it seems that a word must be said, even if without detail.
A weak hadith, by the consensus of the scholars, does not yield anything but a weak conjecture. A weak hadith does not yield, according to the scholars, anything but a weak conjecture. Conjecture is of two types, or rather, we say: three. Conjecture in the sense of certainty, and this is very rare, ; that is, I became certain. The second conjecture is the strong conjecture; that is, it is closer to the truth than to error, and this is what Muslims must act upon, whether in narration or understanding. The third and final conjecture, of which there is no fourth, is the weak conjecture, which is equivalent to mere suspicion. This weak conjecture is derived from a weak hadith. The strong conjecture is derived from a hadith that is above weak, namely the hasan and the sahih. And conjecture in the sense of certainty is taken from the mutawatir hadiths. If it is...