The reasonable probability is that Jesus spoke Hebrew, Koine Greek and Aramaic. He likely used Hebrew in its religious context, Greek when speaking with Gentiles and Aramaic all of the rest of the time. The Lord's Prayer was probably spoken in Aramaic. Since all four of the Gospels were written in Koine Greek, there are lots of dissertations that can be written guessing what He really said in the language in which He said it.