Musk is the best of perfumes

Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "The best of perfumes is musk."

It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) was asked about musk, and he said: "It is the best of your perfumes."
This hadith has an authentic chain, because Khulayd bin Ja'far and al-Mustamirr bin al-Rayyan are counted among the reliable (thiqah) narrators, although the two Shaykhs did not narrate from them. It has a supporting narration (shahid) from Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) as well, and this is also the position of Imam Ahmad bin Hanbal:

Abu Wa'il narrates that Sayyiduna Ali (may Allah be pleased with him) had some musk, and he left instructions that he should be embalmed with it (hanut, the perfume for the deceased). And Ali (may Allah be pleased with him) said that it was what remained of the hanut of the Messenger of Allah (peace and blessings be upon him).

It is reported from Sayyiduna Buraydah (may Allah be pleased with him) that when the people began to wash the Messenger of Allah (peace and blessings be upon him), a caller called out to them from inside: "Do not take off the shirt of the Messenger of Allah (peace and blessings be upon him)."
This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it, and the Abu Burdah among these narrators is in fact Burayd bin Abdullah bin Abi Burdah bin Abi Musa al-Ash'ari, who is a principal narrator of the two Sahihs.

Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) narrates: I washed the Messenger of Allah (peace and blessings be upon him), and I wanted to see what (traces) occur with a deceased person, but I did not see anything of the kind. He (peace and blessings be upon him) was pure and fragrant both in his life and in his death. The honour of burying him and lowering him into the grave fell, rather than to the people at large, to these four: Ali, Abbas, Fadl and Salih, the freed slave of the Messenger of Allah (peace and blessings be upon him) (may Allah be pleased with them). A niche grave (lahd) was prepared for the Messenger of Allah (peace and blessings be upon him), and unbaked bricks (labin) were set upright over it.
This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they recorded only the part about the lahd from it.