Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
ahmad:17017ʿAttāb b. Ziyād > ʿAbdullāh > al-Sarī b. Yaḥyá > Kathīr b. Ziyād

[Machine] Ibn 'Abbas said: "I saw the Messenger of Allah ﷺ rinsing his mouth and sniffing water up his nose during Ramadan."  

أحمد:١٧٠١٧حَدَّثَنَا عَتَّابُ بْنُ زِيَادٍ قَالَ حَدَّثَنَا عَبْدُ اللهِ حَدَّثَنَا السَّرِيُّ بْنُ يَحْيَى عَنْ كَثِيرِ بْنِ زِيَادٍ قَالَ قَالَ

ابْنُ عَبَسَةَ رَأَيْتُ رَسُولَ اللهِ ﷺ مَضْمَضَ وَاسْتَنْشَقَ فِي رَمَضَانَ