One Piece Chapter 52, page 19-20: OATH

As the smoke clears, Krieg's men realize Mihawk has already vanished. "GONE ALREADY..." they mutter in disbelief. Luffy yells to Usopp, Johnny, and Yosaku on their boat, "USOPP! GO ON AHEAD! ALRIGHT! ZORO AND I'LL DEFINITELY BRING BACK NAMI! SO YOU MAKE SURE TO GET US A COOK!". Usopp and the bounty hunters set sail to pursue Nami, leaving Luffy behind at the Baratie.

Luffy smiles excitedly, declaring, "ONCE WE HAVE 5 PEOPLE IN OUR CREW! LET'S HEAD TO GRAND LINE!". Sanji stands nearby, lighting a cigarette and looking toward Krieg's remaining forces, muttering, "THEY'RE FINALLY COMING. DAMN PESTS." Luffy turns to Zeff and asks, "HEY OLD MAN! IF I CHASE THEM AWAY FOR YOU, WILL YOU LET ME OFF THE HOOK?" from his chore boy duties. Zeff replies, "FINE, DO AS YOU WISH!".