صحيح ابن خزيمه
Sahih Ibn Khuzaymah
جماع أبواب التيمم عند الإعواز من الماء فى السفر،Chapters on Tayammum when Water is Unavailable
(211) بَابُ ذِكْرِ الدَّلِيلِ عَلَى أَنَّ الْجُنُبَ يَجْزِيهِ التَّيَمُّمُ عِنْدَ الْإِعْوَازِ مِنَ الْمَاءِ فِي السَّفَرِChapter 211: Evidence that tayammum suffices for one in major impurity when water is lacking during travel
Hadith Q271
وَالدَّلِيلُ عَلَى أَنَّ التَّيَمُّمَ لَيْسَ كَالْغُسْلِ فِي جَمِيعِ أَحْكَامِهِ، إِذِ الْمُغْتَسِلُ مِنَ الْجَنَابَةِ لَا يَجِبُ عَلَيْهِ غُسْلٌ ثَانٍ إِلَّا بِجَنَابَةٍ حَادِثَةٍ، وَالتَّيَمُّمُ فِي الْجَنَابَةِ عِنْدَ الْإِعْوَازِ مِنَ الْمَاءِ يَجِبُ عَلَيْهِ غُسْلٌ عِنْدَ وُجُودِ الْمَاءِ
And the explanation of this evidence that tayammum is not like ghusl in all legal rulings, because a person who performs ghusl due to janabah will only be required to perform ghusl again when he becomes junub again. Whereas a person who performs tayammum due to janabah in the absence of water will be required to perform ghusl when water becomes available.
