We set out on a journey. One of our people was hurt by a stone, that injured his head. He then had a sexual dream. He asked his fellow travelers: Do you find a concession for me to perform tayammum? They said: We do not find any concession for you while you can use water. He took a bath and died. When we came to the Prophet ﷺ, the incident was reported to him. He said: They killed him, may Allah kill them! Could they not ask when they did not know? The cure for ignorance is inquiry. It was enough for him to perform tayammum and to pour some drops of water or bind a bandage over the wound (the narrator Musa was doubtful); then he should have wiped over it and washed the rest of his body.  

خَرَجْنَا فِي سَفَرٍ فَأَصَابَ رَجُلاً مِنَّا حَجَرٌ فَشَجَّهُ فِي رَأْسِهِ ثُمَّ احْتَلَمَ فَسَأَلَ أَصْحَابَهُ فَقَالَ هَلْ تَجِدُونَ لِي رُخْصَةً فِي التَّيَمُّمِ فَقَالُوا مَا نَجِدُ لَكَ رُخْصَةً وَأَنْتَ تَقْدِرُ عَلَى الْمَاءِ فَاغْتَسَلَ فَمَاتَ فَلَمَّا قَدِمْنَا عَلَى النَّبِيِّ ﷺ أُخْبِرَ بِذَلِكَ فَقَالَ قَتَلُوهُ قَتَلَهُمُ اللَّهُ أَلاَّ سَأَلُوا إِذْ لَمْ يَعْلَمُوا فَإِنَّمَا شِفَاءُ الْعِيِّ السُّؤَالُ إِنَّمَا كَانَ يَكْفِيهِ أَنْ يَتَيَمَّمَ وَيَعْصِرَ أَوْ يَعْصِبَ شَكَّ مُوسَى عَلَى جُرْحِهِ خِرْقَةً ثُمَّ يَمْسَحَ عَلَيْهَا وَيَغْسِلَ سَائِرَ جَسَدِهِ  

A man was injured during the lifetime of the Messenger of Allah ﷺ; he then had a sexual dream, and he was advised to wash and he washed himself. Consequently he died. When this was reported to the Messenger of Allah ﷺ he said: They killed him; may Allah kill them! Is not inquiry the cure of ignorance?  

أَصَابَ رَجُلاً جُرْحٌ فِي عَهْدِ رَسُولِ اللَّهِ ﷺ ثُمَّ احْتَلَمَ فَأُمِرَ بِالاِغْتِسَالِ فَاغْتَسَلَ فَمَاتَ فَبَلَغَ رَسُولَ اللَّهِ ﷺ فَقَالَ قَتَلُوهُ قَتَلَهُمُ اللَّهُ أَلَمْ يَكُنْ شِفَاءُ الْعِيِّ السُّؤَالَ