Since I don't watch the show, I wasn't afraid of Googling for you. :) According to the Battlestar Wiki (http://en.battlestarwiki.org/):

During the funeral service at the end of the Mini-series, Priest Elosha chants a prayer in a foreign language. It is recognizable as a common Sanskrit prayer, found in Part I, Chapter III, Verse 28 of the Brihadaranyaka Upanishad.

Although the lyrics are identifiable, it should be noted that the actress's performance is closer to the chanting of biblical Hebrew, and does not resemble the traditional melody.