Bava Metzia 115 - What May Not be Taken as a Security

One who takes a portable mill as a security is liable for taking two utensils, for it is stated, " He shall not take a lower millstone or an upper millstone as a security ..." Therefore, even if the lender was warned only once not to take the borrower's mill, he is liable to two sets of lashes.

Furthermore, one is liable for taking any item that the debtor requires for his food preparation, because "... he is taking a life as a security ."