as for al-Būṣīrī's statement: ".. the ḥadīth of al-Muṭṭalib ibn Abī Wadāʿah"; it is an error that has been previously pointed out in the mentioned commentator's words. I also fell into this error when I authored my book "The Rulings on Funerals and Their Innovations" about twenty-five years ago. Then, the esteemed Dr. ʿAbd al-ʿAlīm ʿAbd al-ʿAẓīm, may Allāh reward him, alerted me to it based on what is in "Tuḥfat al-Ashrāf" by al-Ḥāfiẓ al-Mizzī. then when I re-examined the isnād and the biography of (Kathīr ibn Zayd), the error became clear to me, and I gained further insight when I saw that Ibn Saʿd had reported the ḥadīth (3/399) in a summarized form from the route of Kathīr ibn Zayd from al-Muṭṭalib ibn ʿAbd Allāh ibn Ḥanṭab.. and although he narrated it from his teacher Muḥammad ibn ʿUmar, who is al-Wāqidī, and he is abandoned, in cases like ours, even if it does not benefit, it does not harm. more than one person has indicated the authenticity of the ḥadīth in general; Ibn ʿAbd al-Barr said in the biography of (ʿUthmān ibn Maẓʿūn) from "al-Istīʿāb": "The Messenger of Allāh ﷺ marked his grave with a stone, and he used to visit it." similarly, Ibn al-Athīr said in "Usd al-Ghābah." I also found a brief supporting narration from the route of Abū Bakr ibn Muḥammad ibn ʿAmr ibn Ḥazm who said: I saw the grave of ʿUthmān ibn Maẓʿūn and there was something elevated by it, meaning: as if it was a marker. Ibn Saʿd reported it (3/397) with a good isnād from him. this indicates that the stone which the Messenger of Allāh ﷺ placed with his hand remained on the grave of Ibn Maẓʿūn (raḍiya Allāhu ʿanhu) until the second century of Hijrah; for Abū Bakr ibn Muḥammad ibn Ḥazm died in the year one hundred and twenty, and it appears from his saying: "something" that the stone was not visible, perhaps due to the accumulation of soil over it. And Allāh knows best