Prophets

The Prophets as the Bajorans know them, Siblings to the Eav'oq or Wormhole aliens to Starfleet are a race of non-corporeal aliens who reside in the Bajoran wormhole outside of linear space time.

The Prophets and Bajor
The Prophets have been involved with affairs of the Bajoran people for millennia. The Bajora began the worship of the Prophets which soon spread over much of the planet to the point where the planet and people were named after the Bajora. (DS9 Gateways short story: Horn and Ivory)

The Prophets sent nine Orbs to Bajor which can sometimes induce effects on those exposed to them, these have been interpreted as messages and sometimes even communication with he Prophets.

Other Information
Out of respect for the Prophets the Iconians did not generally build Gateways within a ten lightyear radius of the wormhole.