The debtor is an eved to the creditor: Rosh HaShanah 31b, Gittin 14a
The debtor must follow the creditor to whatever court he desires: Rosh HaShanah 31b
A blessing for a forgiver of debt: Ketuvot 19a
Collection Procedure
Is Collection Retroactive, or from time of Default: Pesachim 30b-31b
When collection is done, the Bill is torn up: Bava Metzia 16b [3x]
Determining the date when the debt comes due, if it had never been specified: Makkot 3b
What one should do if a borrower re-pays him with extra coins, to determine whether this was an error or a gift: Bava Metzia 63b-64a
Assuming that overpayment of a debt may actually be a thief's attempt to return that which he had stolen: Bava Metzia 63b-64a
A lender may not pass before a borrower if one knows the borrower cannot re-pay: Bava Metzia 75b
Passing before a borrower who cannot repay causes him to suffer as though he was burning and drowning: Bava Metzia 75b
Specific Types of Debts
Collecting on an oral loan: Bava Metzia 15a
Forcing repayment of a loan made orally on a Holiday: Shabbat 148b
The above issue, where the Borrower actually said "Collection will be from this object from now" when presenting the Collateral/Liened Property: Pesachim 31b
Collection from non-liquid Property
Collecting the fruits of a field, to repay an outstanding debt of the field's seller: Bava Metzia 14b, 15a
Collecting from Sales or Sanctification of the Debtor, if done during the time of debt: Pesachim 30b-31b
Payback doesn't require Witnesses, even if the loan was extended before witnesses: Ketuvot 18a Rabbinic institution protecting Purchasers, forbidding Collection from Third-Party property where the Borrower still has property: Bava Kama 8b
Collecting from a Purchaser who declares preference for not following the Above-Mentioned Institution, because he will benefit more this way: Bava Kama 8b
Institution of returning land used to pay off a debt, if the borrower comes up with cash: Bava Metzia 35b
Collecting from a debtor for a creditor, as a benefit for the creditor: Gittin 11b
Where the creditor tells the borrower to deliver the money to a third party: Gittin 13b
Above Case, if the third party was not born at the time of the loan: Gittin 13b
Where the creditor tells the borrower to give the money to another, before 3 parties: Gittin 13a, 14a
Going back on the Above deal: Gittin 14a
Where the borrower volunteers the information that he owes money: Ketuvot 18a