[Machine] Muawiyah ibn Abu Sufyan said: I asked Umm Habibah, the wife of the Prophet ﷺ , I said, "Did the Messenger of Allah ﷺ pray in the garment that he had intimate relations with his wives in?" She said, "Yes, if he did not see any impurity on it." And the reports about the purity of his sweat are already mentioned in the book of purification.  

عَنْ مُعَاوِيَةَ بْنِ أَبِي سُفْيَانَ يَقُولُ سَأَلْتُ أُمَّ حَبِيبَةَ زَوْجَ النَّبِيِّ ﷺ قُلْتُ هَلْ كَانَ رَسُولُ اللهِ ﷺ يُصَلِّي فِي الثَّوْبِ الَّذِي يُجَامِعُهَا فِيهِ؟ قَالَتْ نَعَمْ إِذَا لَمْ يَرَ فِيهِ أَذًى وَقَدْ مَضَتِ الْأَخْبَارُ فِي طَهَارَةِ عَرَقِهِ فِي كِتَابِ الطَّهَارَةِ