One Piece S04 E123 That Looks Croc-ish! Luffy, Run to the Royal Tomb!

"Set sail for One Piece!"

Crocodile joins Robin in the tomb, and orders her to translate the Poneglyph. Robin tells him that Pluton was not mentioned and that it was only about history, but Crocodile figures out that she was lying and stabs her in response. When Luffy recovers from the last round of fighting, he chases after Crocodile into the tomb.