Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates in explanation of the verse: «وَإِنْ كُنْتُمْ مَرْضَى أَوْ عَلَى سَفَرٍ» (If you are ill or on a journey...) in a marfu’ (attributed to the Prophet) narration: If a person is wounded in the path of Allah, or has a boil, abscess, or is afflicted with smallpox, and he becomes junub (in a state requiring ritual bath), and fears death if he performs ghusl (ritual bath), then he should perform tayammum (dry ablution).