Abu Dawud

Benefits and Issues:
In this hadith, the mention of taking separate handfuls of water for rinsing the mouth (kuli) and for the nose is present. Imam Nawawi, Hafiz Ibn Hajar, and the scholar of the era, Allamah Nasiruddin al-Albani rahimahumullah, have also declared this narration to be weak. Therefore, the Sunnah and recommended practice is to take a single handful of water, use it to rinse the mouth, and with the same water, cleanse the nose, because this was also the practice of the Messenger of Allah sallallahu alayhi wa sallam. As is explicitly stated in Sahih al-Bukhari from Abdullah ibn Abbas radi Allahu anhuma. However, some scholars have also held the view that it is permissible to take two separate handfuls for the mouth and nose, but the narrations regarding cleansing both the mouth and nose with a single handful are stronger and more authentic in terms of their chain of transmission. «والله اعلم»

Lexical Explanation:
«يَفْصِلُ» used to differentiate, meaning you would take separate water for rinsing the mouth (kuli) and separate water for drawing up into the nose.

Benefit:
From this hadith, it is established to take separate water for rinsing the mouth and for the nose. However, this narration is weak in terms of its chain of transmission, because in its chain, Musrif bin Ka'b is unknown (majhool) and Laith bin Abi Sulaim is a weak narrator. In contrast, in the ahadith of Sahih Bukhari and Sahih Muslim, it is mentioned that the Prophet sallallahu alayhi wa sallam would take water from a single handful for both rinsing the mouth and drawing water into the nose.

Narrator of the Hadith:
SR Talhah bin Musrif rahimahullah ER His kunyah is Abu Muhammad or Abu Abdullah. The pronunciation of Musrif is with a dammah on the "meem" and a kasrah with shaddah on the "raa." He was counted among the trustworthy and eminent Tabi'in. He belonged to the fifth generation (tabiqa khamisa). He was an excellent reciter (qari) and a virtuous personality. He passed away in 112 AH. However, his father Musrif is of unknown status (majhool al-haal), and for this reason, this narration is weak.
«عَنْ جَدِّهِ» His name is Ka'b bin Amr or Amr bin Ka'b bin Jahdab al-Yami radi Allahu anhu. Due to his affiliation with the well-known tribe "Yam" from the famous tribes of Hamdan in Yemen, he is called "Yami." According to the statement of Ibn Abd al-Barr, he settled in Kufa. He is a companion (sahabi). Some people have denied his companionship, but there is no reason for the denial of those who deny it.