There was an apocryphal work attributed to the Eldad and Medad, who prophesied in Numbers 11:26. Only one line remains from the original, quoted in another apocryphal work called the Shepherd of Hermas: "The Lord is near unto them that turn to Him, as it is written in Eldad and Medad...". This one surviving bit is almost exactly the same as Psalm 145:18, "YHWH is near to all who call on him." It would be really neat to know exactly what they prophesied, but most prophecies don't actually say anything new. They just rephrase or re-illustrate what God has already told us.