Grading: This chain is of "hasan" level because of Abd Allah bin al-Muthanna al-Ansari.
Technical note / Defect ('illah): Thumamah mentioned in the chain is Thumamah bin Abd Allah bin Anas bin Malik.

Reference / Source: Imam al-Bayhaqi transmitted it in "al-Madkhal" (761) via Imam al-Hakim with this same chain.

Reference / Source: Ibn Sa'd narrated it in "al-Tabaqat" (5/ 337 and 9/ 22), Zuhayr bin Harb in "al-'Ilm" (120), and al-Khatib al-Baghdadi in "Taqyid al-'Ilm" (p. 96) through the route of Muhammad bin Abd Allah al-Ansari with this same chain.

Reference / Source: Imam al-Darimi (508), al-Ramahurmuzi in "al-Muhaddith al-Fasil" (326), al-Tabarani in "al-Mu'jam al-Kabir" (700), al-Khatib (p. 97), Ibn Abd al-Barr in "Bayan al-'Ilm wa Fadlih" (410) and Qadi Iyad in "al-Ilma'" (p. 147) narrated it through various routes from Abd Allah bin al-Muthanna.

Technical note / Defect ('illah): Abd al-Hamid bin Sulayman al-Khuza'i, going against the other narrators, narrated it from Abd Allah bin al-Muthanna with this same chain as "marfu'" (as a saying of the Prophet (peace and blessings be upon him)).
Reference / Source: Luwayn transmitted it in his "Juz'" (54), and through him al-Ramahurmuzi (327), Abu al-Shaykh al-Isfahani (909), Ibn Shahin (624), Abu Tahir in "al-Mukhallisiyyat" (556), al-Khatib al-Baghdadi in "Tarikh Baghdad" (11/ 234), Ibn Abd al-Barr (395), Ibn al-Jawzi (94) and Ibn Asakir (37/ 352-353) narrated it.

Grading: Abd al-Hamid bin Sulayman is a weak narrator, and he fell into "wahm" (error) in narrating this report as marfu'.
Technical note / Defect ('illah): Imam al-Daraqutni says in "al-'Ilal" (12/ 43) that what is correctly reported from Thumamah is that Anas (may Allah be pleased with him) used to say this to his sons and did not attribute it to the Prophet. Al-Hafiz Musa bin Harun also stated explicitly that Abd al-Hamid's narrating it as marfu' is not correct.

Technical note / Defect ('illah): Isma'il bin Abi Uways also narrated it as marfu' (see: Akhbar Isbahan 2/ 228 and Musnad al-Shihab 637).
Grading: Although Isma'il bin Abi Uways has been criticised, he is taken into account in corroborating chains; however, Abd Allah bin al-Muthanna is in a better state than him, so Abd Allah's "mawquf" narration is given precedence and preferred over Isma'il's "marfu'" narration; and Allah knows best.