What does hector swear to do with achilles body if he dies?

Hector swears that if he kills Achilles, he will respect his body by returning it to the Greeks for them to be able to give Achilles a proper burial. However, what happened is that Achilles killed Hector as revenge for his friend Patroclus. Additionally, he dragged Hector's body using his chariot and around Patroclus' tomb. 

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