Saying
      salaam before the imaam in cases of urgent need
Question

                If a person who is
      praying behind the imaam needs desperately to urinate or pass wind, and he
      is in the final Tashahhud, will his prayer still be valid if he says
      salaam before the imaam, after doing all the necessary parts or
      “pillars” of the prayer?
Praise be to Allah.We put this question to Shaykh Muhammad ibn Saalih
    al-‘Uthaymeen, may Allaah preserve him, who replied as follows:
Yes, his prayer will still be valid, because he has an
    excuse. And Allaah knows best.