Is it permissible to use available money to complete building a house, or to pay off part of a deferred debt (installments not due until later)?

The jurists differed regarding the time for repaying a loan. The majority hold that it is obligatory to repay it immediately when the creditor requests it. Some even went further, asserting that it is obligatory immediately, even without a request. Therefore, the questioner should seek permission from the creditor. If he grants permission, then fine; otherwise, he should repay it immediately, especially since the employer lent him money due to his poverty, and may demand the debt if he learns of his new wealth, and for fear that he might not be able to repay it in the future.