A Junub can perform Tayammum if he is afraid of disease, death or thirst
باب إِذَا خَافَ الْجُنُبُ عَلَى نَفْسِهِ الْمَرَضَ أَوِ الْمَوْتَ أَوْ خَافَ الْعَطَشَ، تَيَمَّمَ
Sahih al-Bukhari, Book of Rubbing hands and feet with dust (Tayammum)(view book)
Narrated Abu Wail:
Abu Musa said to'Abdullah bin Mas'ud, "If one does not find water (for ablution) can he give up the prayer?" Abdullah replied, "If you give the permission to perform Tayammum they will perform Tayammum even if water was available if one of them found it cold." Abu Musa said, "What about the statement of 'Ammar to 'Umar?" 'Abdullah replied, "Umar was not satisfied by his statement."
حَدَّثَنَا بِشْرُ بْنُ خَالِدٍ، قَالَ حَدَّثَنَا مُحَمَّدٌ ـ هُوَ غُنْدَرٌ ـ عَنْ شُعْبَةَ، عَنْ سُلَيْمَانَ، عَنْ أَبِي وَائِلٍ، قَالَ قَالَ أَبُو مُوسَى لِعَبْدِ اللَّهِ بْنِ مَسْعُودٍ إِذَا لَمْ يَجِدِ الْمَاءَ لاَ يُصَلِّي. قَالَ عَبْدُ اللَّهِ لَوْ رَخَّصْتُ لَهُمْ فِي هَذَا، كَانَ إِذَا وَجَدَ أَحَدُهُمُ الْبَرْدَ قَالَ هَكَذَا ـ يَعْنِي تَيَمَّمَ وَصَلَّى ـ قَالَ قُلْتُ فَأَيْنَ قَوْلُ عَمَّارٍ لِعُمَرَ قَالَ إِنِّي لَمْ أَرَ عُمَرَ قَنِعَ بِقَوْلِ عَمَّارٍ.
Classification
Narrated Shaqiq bin Salama:
I was with 'Abdullah and Abu Musa;
the latter asked the former, "O Abu AbdurRahman! What is your opinion if somebody becomes Junub and no water is available?" 'Abdullah replied, "Do not pray till water is found." Abu Musa said, "What do you say about the statement of 'Ammar (who was ordered by the Prophet to perform Tayammum). The Prophet ﷺ said to him: "Perform Tayammum and that would be sufficient." 'Abdullah replied, "Don't you see that 'Umar was not satisfied by 'Ammar's statement?" Abu- Musa said, "All right, leave 'Ammalr's statement, but what will you say about this verse (of Tayammum)?" 'Abqiullah kept quiet and then said, "If we allowed it, then they would probably perform Tayammum even if water was available, if one of them found it (water) cold." The narrator added, "I said to Shaqrq, "Then did 'Abdullah dislike to perform Tayammum because of this?" He replied, "Yes."
حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ، قَالَ حَدَّثَنَا أَبِي قَالَ، حَدَّثَنَا الأَعْمَشُ، قَالَ سَمِعْتُ شَقِيقَ بْنَ سَلَمَةَ، قَالَ كُنْتُ عِنْدَ عَبْدِ اللَّهِ وَأَبِي مُوسَى فَقَالَ لَهُ أَبُو مُوسَى أَرَأَيْتَ يَا أَبَا عَبْدِ الرَّحْمَنِ إِذَا أَجْنَبَ فَلَمْ يَجِدْ، مَاءً كَيْفَ يَصْنَعُ فَقَالَ عَبْدُ اللَّهِ لاَ يُصَلِّي حَتَّى يَجِدَ الْمَاءَ. فَقَالَ أَبُو مُوسَى فَكَيْفَ تَصْنَعُ بِقَوْلِ عَمَّارٍ حِينَ قَالَ لَهُ النَّبِيُّ ﷺ " كَانَ يَكْفِيكَ " قَالَ أَلَمْ تَرَ عُمَرَ لَمْ يَقْنَعْ بِذَلِكَ. فَقَالَ أَبُو مُوسَى فَدَعْنَا مِنْ قَوْلِ عَمَّارٍ، كَيْفَ تَصْنَعُ بِهَذِهِ الآيَةِ فَمَا دَرَى عَبْدُ اللَّهِ مَا يَقُولُ فَقَالَ إِنَّا لَوْ رَخَّصْنَا لَهُمْ فِي هَذَا لأَوْشَكَ إِذَا بَرَدَ عَلَى أَحَدِهِمُ الْمَاءُ أَنْ يَدَعَهُ وَيَتَيَمَّمَ. فَقُلْتُ لِشَقِيقٍ فَإِنَّمَا كَرِهَ عَبْدُ اللَّهِ لِهَذَا قَالَ نَعَمْ.