Sunan Abu Dawud No 4002 Book 32 Hadith 3991 Bk 32.34
https://sunnah.com/abudawud:4002
Narrated Abu Dharr: I was sitting behind the Messenger of Allah (Peace be upon him) who was riding a donkey while the sun was setting. He asked: Do you know where this sets ? I replied: Allah and his Apostle know best. He said: It sets in a spring of warm water (Hamiyah).

Sahih Al Bukhari 6.326 Bk 65.324:
https://sunnah.com/bukhari:4802
Narrated Abu Dharr: Once I was with the Prophet in the mosque at the time of sunset. The Prophet said, "O Abu Dharr! Do you know where the sun sets?" I replied, "Allah and His Apostle know best." He said, "It goes and prostrates underneath (Allah's) Throne; and that is Allah's Statement:−− 'And the sun runs on its fixed course for a term (decreed). And that is the decree of All−Mighty, the All−Knowing....' (36.38)

Sahih Al Bukhari 6.327 Bk 65.325:
https://sunnah.com/bukhari:4803
Narrated Abu Dharr: I asked the Prophet about the Statement of Allah:−− 'And the sun runs on fixed course for a term (decreed), ' (36.38) He said, "Its course is underneath "Allah's Throne." (Prostration of Sun trees, stars. mentioned in Qur'an and Hadith does not mean like our prostration but it means that these objects are obedient to their Creator (Allah) and they obey for what they have been created for).

Sahih Al Bukhari 9.520 Bk 97.52:
https://sunnah.com/bukhari:7424
Narrated Abu Dharr: I entered the mosque while Allah's Apostle was sitting there. When the sun had set, the Prophet said, "O Abu Dharr! Do you know where this (sun) goes?" I said, "Allah and His Apostle know best." He said, "It goes and asks permission to prostrate, and it is allowed, and (one day) it, as if being ordered to return whence it came, then it will rise from the west." Then the Prophet recited, "That: "And the sun runs on its fixed course (for a term decreed)," (36.38) as it is recited by `Abdullah.

Sahih Al Bukhari 9.528 Bk 97.60:
https://sunnah.com/bukhari:7433
Narrated Abu Dharr: I asked the Prophet regarding the Verse:−−'And the sun runs on its fixed course for a term decreed for it.' (36.28) He said, "Its fixed course is underneath Allah's Throne."

Sahih Muslim Bk 1, Number 0297 Bk 1.304:
https://sunnah.com/muslim:159a
It is narrated on the authority of Abu Dharr that the Messenger of Allah (may peace be upon him) one day said: Do you know where the sun goes? They replied: Allah and His Apostle know best. He (the Holy Prophet) observed: Verily it (the sun) glides till it reaches its resting place under the Throne. Then it falls prostrate and remains there until it is asked: Rise up and go to the place whence you came, and it goes back and continues emerging out from its rising place and then glides till it reaches its place of rest under the Throne and falls prostrate and remains in that state until it is asked: Rise up and return to the place whence you came, and it returns and emerges out from it rising place and the it glides (in such a normal way) that the people do not discern anything ( unusual in it) till it reaches its resting place under the Throne. Then it would be said to it: Rise up and emerge out from the place of your setting, and it will rise from the place of its setting. The Messenger of Allah (may peace be upon him) said. Do you know when it would happen? It would happen at the time when faith will not benefit one who has not previously believed or has derived no good from the faith.

Sahih Muslim Bk 1, Number 0298 Bk 1.305:
It is narrated on the authority of Abu Dharr that the Apostle of Allah (may peace be upon him) one day said: Do you know where the sun goes? The remaining part of the hadith is the same.

Sahih Muslim Bk 1, Number 0299 Bk 1.306:
Abu Dharr reported: I entered the mosque and the Messenger of Allah (may peace be upon him) was sitting there. When the sun disappeared (from the sight) he said: O Abu Dharr! Do you know where it goes? He (the narrator) said: Allah and His Apostle know best. He (the Holy Prophet) said. Verily it goes and begs permission, for prostration (to Allah) and the permission is granted to it. Once it would be said: Return to the place whence you came, and then it would rise from its setting place. Then he, after the recitation of 'Abdullah recited it: And that is its appointed term.

Sahih Muslim Bk 1, Number 0300 Bk 1.307:
Abu Dharr reported: I asked the Messenger of Allah (may peace be upon him) the (implication of the) words of Allah, the Exalted: The sun glides to its appointed resting place. He replied: Its appointed resting place is under the Throne.