Answer:
(Fatwa: 1603/1604/M=1431)
The salah shall be valid without musalla (prayer rug) if the place where one intends to offer salah is pak (clean). People enter in rooms wearing shoes and sometime the shoes carry nijasah (impurity); hence, one should offer salah in neat and clean place.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
