This incident shows how forgiving the blessed Prophet, may peace be upon him, to the mistake of others:
During the early days Prophet’s (PBUH) masjid floor was barely sand.
One day, a Bedouin came to the masjid of the Prophet, peace be upon him, in Medina. He urinated in the middle of the masjid.
Several of the Companions, may Allah be pleased with them, got very upset at this sight and angrily came up to him, trying to get him to stop.
Prophet Muhammad, (pbuh) told them to let him finish as he has already done it half way.
When the Bedouin was done, Prophet Muhammad (pbuh) gently advised him that this was the House of Allah, and thus an inappropriate place to urinate. The Messenger of Allah (pbuh) then asked to clean the place with water.