How is Pap first introduced in Huck Finn?

In Chapter 4 as soon as Huck leaves the house, he notices boot prints in the fresh snow. Upon closer inspection he realizes that there is a cross on the left boot-heel, which he has only ever seen in his Pap's. Huck's Pap has returned. Aware that Pap is probably after his money (the $6,000 that he got from sharing the treasure with Tom), Huck goes to Judge Thatcher and begs the Judge to take all his money as a gift. The Judge is quite surprised by the request, but when Huck refuses to reveal why he wants to give away his money, Judge Thatcher agrees to "buy" it for one dollar, saying he will take the money "for a consideration." Huck returns to his room that night and finds his Pap sitting there. Basically Pap then harasses Huck over money.