"Narrated Abu Dhar: The Prophet asked me at sunset, ‘Do you know where the sun goes (at the time of sunset)?’ I replied, ‘Allah and His Apostle know better.’ He said, ‘It goes (i.e. travels) till it prostrates itself underneath the Throne, and takes the permission to rise again, and it is permitted and them (a time will come when) it will be about to prostrate itself but its prostration will not be accepted,…’" Bukhari vol.4 book 54 ch.4 no.441 p.283. Sahih Muslim vol.1 book 1 ch.73 no.297-300 p.95-96 also has a lot of detail on this conversation with Mohammed and Abu Dharr.
"Abu Dhar alisimulia: Nabii aliniuliza wakati wa machweo ya jua, ‘Unafahamu mahali ambako jua linakwenda (wakati wa kuchwa)?’ Nilijibu, ‘Allah na Mtume wake wanafahamu vizuri zaidi.’ Alisema, ‘Linakwenda (yaani linasafiri) hadi linasujudu chini ya kiti cha enzi, na linapata kibali cha kusimama tena, na linaruhusiwa na kisha (muda utakuja ambapo) litakuwa linakaribia kusujudu lakini kusujudu kwake hakutakubaliwa …’" Bukhari juzuu ya 4 kitabu cha 54 sura ya 4 na.441 uk.283.