Sunan Abi Dawud 27
سنن أبي داود#27Sahihحَدَّثَنَا أَحْمَدُ بْنُ مُحَمَّدِ بْنِ حَنْبَلٍ، وَالْحَسَنُ بْنُ عَلِيٍّ، قَالاَ حَدَّثَنَا عَبْدُ الرَّزَّاقِ، قَالَ أَحْمَدُ حَدَّثَنَا مَعْمَرٌ، أَخْبَرَنِي أَشْعَثُ، وَقَالَ الْحَسَنُ، عَنْ أَشْعَثَ بْنِ عَبْدِ اللَّهِ، عَنِ الْحَسَنِ، عَنْ عَبْدِ اللَّهِ بْنِ مُغَفَّلٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لاَ يَبُولَنَّ أَحَدُكُمْ فِي مُسْتَحَمِّهِ ثُمَّ يَغْتَسِلُ فِيهِ " . قَالَ أَحْمَدُ " ثُمَّ يَتَوَضَّأُ فِيهِ فَإِنَّ عَامَّةَ الْوَسْوَاسِ مِنْهُ " .
Narrated Abdullah ibn Mughaffal: The Messenger of Allah (ﷺ) said: No one of you should make water in his bath and then wash himself there (after urination). The version of Ahmad has: Then performs ablution there, for evil thoughts come from it
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 1:27