Important point: In the handwritten manuscripts (S) and (M) this name is corrupted and written as "Sa'id".

Grading: Without the mention of olive oil, this hadith is "sahih li-ghayrihi" (sahih due to supporting reports).
Technical note / Defect ('illah): This chain is da'if because of "Maymun Abu Abd Allah" (al-Basri al-Kindi). This narrator was inconsistent (idtirab) in the wording of the hadith: sometimes he mentions qust (costus) together with olive oil, sometimes olive oil and wars (a yellow plant), and sometimes he mentions all three together.

Reference / Source: Al-Tirmidhi recorded it (2079) by way of Raja' bin Muhammad al-Udhri, from Amr bin Muhammad bin Abi Razin, with this same chain, and said: This hadith is "hasan sahih"; we know it only from the route of Maymun from Zayd bin Arqam, though more than one person narrated it from Maymun. He also explained "dhat al-janb" as "sill" (tuberculosis/lung disease).

Reference / Source: Ahmad recorded it in the "Musnad" 32 / (19289) and al-Nasa'i (7545) by way of Abu Dawud al-Tayalisi, from Shu'bah bin al-Hajjaj. This narration will come later through another route from Shu'bah under number (8438).

Details of the narration: This narration will come by way of Qatadah under numbers (7632) and (8444), and by way of Abd al-Rahman bin Maymun under number (7633); both of them narrate from Maymun Abu Abd Allah.

Corroborating chains and supporting reports: On this topic the narration of Umm Qays bint Mihsan is found in Sahih al-Bukhari (5718) and Sahih Muslim (2214), whose wording is: "Make use of this Indian aloeswood (qust), for in it there are cures for seven diseases, among them dhat al-janb."

Note / Clarification: "Dhat al-janb" refers to inflammation of the membrane surrounding the lungs (pleurisy).

Note / Clarification: Sea costus (al-qust al-bahri) is the same as Indian aloeswood. Abu Bakr Ibn al-Arabi says that qust is of two kinds: Indian, which is black, and sea, which is white, and the Indian is the hotter of the two.