Papa Legba

In Haitian Vodou, Papa Legba is the intermediary between the lwa and humanity. He stands at a spiritual crossroads and gives (or denies) permission to speak with the spirits of Guinea, and is believed to speak all human languages. He is always the first and last spirit invoked in any ceremony, because his permission is needed for any communication between mortals and the loa - he opens and closes the doorway. In Haiti, he is the great elocution, the voice of God, as it were. Legba facilitates communication, speech and understanding. In Yoruba, Ellegua is mostly associated with Papa Legba since both share the role of being the god of the crossroads, yet Legba also shares similarities to Orunmila, the orisha of prophesy who taught mankind how to use the mighty oracle Ifá.
See more at Wikipedia.org...

[Haitian] The Haitian voodoo god who acts as an intermediary between the loa and humans. He is also the god of the crossroads; he opens the road to the spirit world. He taught mankind the use of oracles and how to interpret them. Papa Legba is commonly depicted as an old man sprinkling water or an old man with a crutch, and is also known as Legba or Legba Ati-Bon. In any vodoun ceremony, Legba is the first loa invoked, so that he may "open the gate" for communication between the worlds. The dog is his symbolic animal.