Is there any Shar'i basis for placing a financial deposit to guarantee the right to a personal financial sponsorship (Kafalah)?

There is no disagreement among scholars regarding the permissibility of collateral (rahn), based on the Almighty's saying: "then collateral in hand." Collateral is the retention of an item against a right that can be fulfilled from it if the debtor is unable to repay. It is permissible to demand it from the debtor, the guarantor, or the surety.