What Jesus said on the cross was hebrew but does not mean why have you forsaken me. the word "Sabachthani" come from the root word of "Zebach" which means "to slaughter" what jesus said to G-d was My G-d, My G-d, Why have you slaughtered me?
Strong's Dictionary says it is Aramaic.
Strong's Number: 4518
Transliterated: sabachthani
Phonetic: sab-akh-than-ee'
Text: of Aramaic or [7662 with pronominal suffix]; thou hast left me; sabachthani (i.e. shebakthani), a cry of distress: --sabachthani.