In Chapter 5.
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Joe is a kind soul. He wants the convict to eat rather than starve,
"God knows you're welcome to it - so far as it was ever mine," returned Joe, with a saving remembrance of Mrs. Joe. "We don't know what you have done, but we wouldn't have you starved to death for it, poor miserable fellow-creatur. - Would us, Pip?"
I think the convict means any malice, he is honest about his intentions. The convict is just hungry.
Can you provide some quotes?