mi muradabadi, in his famous book, jaa al haq, part 2 mentions that *weak hadeeth can be taken for fazails *but can not be considered for ahkam *if weak hadeeth is followed by ulema of ummath it will become husn. hope it is help ful with salams sahebju
i forgot to say, the above is from shaykhu'l islam wa'l muslimeen [1340], imam ahmad raza khan barelwi's book muneer al-'ayn fi taqbil al-ibhamayn.
