Abu Bakr Ibn Abu Dunya wrote in the book Ahkam-alQubur (The Rules of Graves), based on a long chain of citation, that the Prophet said: "Daniel prayed to his Lord, Great and Majestic for the nation of Muhammad to bury him." And he (i.e. Muhammad, PBUH) said: "Whoever discovers Daniel give him tidings of Paradise." The man who discovered him (his corpse) was called Harqus. Umar sent to Abu Musa saying: "Bury him; and send to Harqus, for the Prophet has given him promise of Paradise."
This hadith is mursal (it has a good chain of citation) as it is recorded, and Allah knows best.