Sunan Abi Dawud 2366
سنن أبي داود#2366Sahihحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنِي يَحْيَى بْنُ سُلَيْمٍ، عَنْ إِسْمَاعِيلَ بْنِ كَثِيرٍ، عَنْ عَاصِمِ بْنِ لَقِيطِ بْنِ صَبِرَةَ، عَنْ أَبِيهِ، لَقِيطِ بْنِ صَبِرَةَ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " بَالِغْ فِي الاِسْتِنْشَاقِ إِلاَّ أَنْ تَكُونَ صَائِمًا " .
Narrated Laqit ibn Saburah: The Prophet (ﷺ) said: Snuff up water freely unless you are fasting
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:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 14:54