What is the rulling of "Tayammum" from the wall or floor of a Masjid. Is it forbidden or Makrooh?
الجواب حامدا ومصليا
Tayammum can only be made on a pure surface where there is some dust on it. Tayammum can also be made with other soil-like things that are taken out of earth land.
Masjid is a pure place and if there is some dust found on its walls then Tayummum can be made from it without any Karaha (dis-likeness).
And Allah knows best.
Mufti Ikram ul Haq
Darul Ifta of Rhode Island
26 Jumada-al Oola 1431/ May 11 2010