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What each grading given by hadith scholars means. Explanations are quoted word for word from a trusted source, never written by AI.
However, in case the weakness is severe (e.g., the reporter is accused of lying or the Hadith is itself irregular), such very weak Ahadith will not support each other and will remain weak.
Al-Haafiz ibn Hajar (may Allah have mercy on him) summed up the conditions for it to be permissible to act upon a weak hadith, which are as follows:
It should not be very weak, and one should not act upon a hadith which was narrated only by one of the liars or those who are accused of lying, or whose mistakes are serious.