and thus it becomes clear that the isnād is authentic because, as you know, the narrators above him are trustworthy. All praise is due to Allāh, by whose grace righteous deeds are completed.

"Use the tooth-stick, for it purifies the mouth and pleases the Lord." It was recorded by Aḥmad (2/108): Qutaybah ibn Saʿīd narrated to us, Ibn Lahīʿah narrated to us from ʿUbayd Allāh ibn Abī Jaʿfar from Nāfiʿ from Ibn ʿUmar that the Prophet (ṣallá Allāhu ʿalayhi wa-sallam) said it, and he mentioned it. I said: Its narrators are trustworthy, the narrators of the two Shaykhs, except for Ibn Lahīʿah, who has poor memory, and it was critiqued by al-Mundhirī (1/101), then al-Haythamī (1/220) who also attributed it to al-Ṭabarānī in "al-Awsaṭ." Then I reconsidered and said: Rather, it is a good isnād because Qutaybah's ḥadīths from Ibn Lahīʿah are authentic, as established by al-Dhahabī in "Siyar Aʿlām al-Nubalāʾ" (8/15), and it was also narrated from Qutaybah by Ibn ʿAsākir (2/472), then it was recorded by him and al-Ṭabarānī (1/177/1/3265). Then I found a corroborating narration from Ḥammād ibn Salamah from ʿUbayd Allāh ibn ʿUmar from al-Maqburī from Abū Hurayrah who said: The Messenger of Allāh (ṣallá Allāhu ʿalayhi wa-sallam) said it, and he mentioned it, except that he said: "It purifies the mouth," and the rest is the same. It was recorded by Ibn Ḥibbān (144). This isnād is good, all its narrators are trustworthy, the narrators of "al-Ṣaḥīḥ," and there is some discussion about Ḥammād ibn Salamah when he narrates from other than Thābit, but it does not harm, so the ḥadīth is authentic. And Allāh is the grantor of success. Then I saw that al-Ḥāfiẓ in "al-Talkhīṣ" (1/60) critiqued this text from Abū Hurayrah