214 - وَ سَأَلَ عُبَيْدُ اَللَّهِ بْنُ عَلِيٍّ اَلْحَلَبِيُّ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ: عَنِ اَلرَّجُلِ إِذَا أَجْنَبَ وَ لَمْ يَجِدِ اَلْمَاءَ قَالَ «يَتَيَمَّمُ بِالصَّعِيدِ فَإِذَا وَجَدَ اَلْمَاءَ فَلْيَغْتَسِلْ وَ لاَ يُعِيدُ اَلصَّلاَةَ» وَ عَنِ اَلرَّجُلِ يَمُرُّ بِالرَّكِيَّةِ وَ لَيْسَ مَعَهُ دَلْوٌ قَالَ «لَيْسَ عَلَيْهِ أَنْ يَدْخُلَ اَلرَّكِيَّةَ لِأَنَّ رَبَّ اَلْمَاءِ هُوَ رَبُّ اَلْأَرْضِ فَلْيَتَيَمَّمْ» وَ عَنِ اَلرَّجُلِ يُجْنِبُ وَ مَعَهُ قَدْرُ مَا يَكْفِيهِ مِنَ اَلْمَاءِ لِوُضُوءِ اَلصَّلاَةِ أَ يَتَوَضَّأُ بِالْمَاءِ أَوْ يَتَيَمَّمُ قَالَ «لاَ بَلْ يَتَيَمَّمُ أَ لاَ تَرَى أَنَّهُ إِنَّمَا جُعِلَ عَلَيْهِ نِصْفُ اَلْوُضُوءِ.
Hadith.214 - Ubaidullah ibn Ali Al-Halabi asked Imam Jafar ibn Muhammad Al-Sadiq 
about a man who becomes junub (ritually impure due to sexual discharge) and does not find water.
Imam said: 'He should perform tayammum with clean earth (sa’eed), and when he finds water, he should perform ghusl, but he does not need to repeat the prayer.'
He also asked about a man who passes by a well but does not have a bucket with him.
Imam said: 'He is not required to enter the well because the Lord (azj) of the water is also the Lord (azj) of the earth, so he should perform tayammum.'.
He asked further about a man who becomes junub and has only enough water to perform wudu (ablution) for prayer; should he use the water for wudu or perform tayammum?
Imam said: 'No, he should perform tayammum. Do you not see that only half of wudu is required of him?'
