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"I hain't got no money."
"It's a lie. Judge Thatcher's got it. You git it. I want it."
"I hain't got no money, I tell you. You ask Judge Thatcher; he'll tell you the same." (5.19-5.24)
Huck has no problem lying later in the book, but here he's got some major scruples about lying to his dad. Why? It's not like Pap is overly concerned with his own honesty. (Check out Pap's "Character Analysis" for more.)
"It's so. You can do it. I had my doubts when you told me. Now looky here; you stop that putting on frills. I won't have it. I'll lay for you, my smarty; and if I catch you about that school I'll tan you good. First you know you'll get religion, too. I never see such a son. (5.12)
To Pap, the only thing worse that his boy gettin' educated is gettin' religion. We can understand that. Thirteen-year-olds are sanctimonious enough without getting all religious and trying to convert their alcoholic, abusive fathers.