Hazrat Ibn Sirin says that I was on a journey for Hajj or Umrah, when the last part of the night came, I became junub (in a state requiring ritual purification). We did not have any water, so I performed tayammum and offered the prayer. When the time of Duha (forenoon) came, a man said, "O Abu Bakr! Did you repeat your prayer?" He replied, "If I do not find water for even twenty years, will I repeat the prayer?"