Is it permissible to take a loan with interest from Faisal Islamic Bank (every ten thousand with an additional one thousand Egyptian pounds) to pay off a debt due before its original due date, in order to avoid harm from the creditor and his sons, knowing that I will repay the amount to the bank after six months?

We do not know the nature of the loan from Faisal Bank. If it is an interest-bearing (usurious) loan with an increase, then it is forbidden (haram (definition)). If it is a Murabaha or organized Tawarruq in metals, then it is also forbidden by the majority of scholars. Usury is not permissible except in cases of necessity.

You can buy an item on installment and sell it yourself, away from the bank, to pay off your debt, or seek assistance from neighbors and those who can help to avert harm from you and explain to the creditor that he has no right to demand his debt before its due time.