This has to do with the requirements under the following Israeli law:

Sale (Apartments) (Assurance of Investments of Purchasers of Apartments) Law - 1973

or in Hebrew

חוק המכר (דירות) (הבטחת השקעות של רוכשי דירות), תשל"ה-1974

without going into a lengthy legal explanation,
under this law, in order to receive from the purchaser more than 15% of the price, one of the options the seller has is to provide the purchaser with a bank guarantee.

in the context you presented, it seems like there is a replacement of a lien on the property (which also is one of the options under the law) with an endorsed bank guarantee.

because this is so connected to this specific law and its unique provisions , I would suggest to add a translators remark in brackets as follows: (under the - Sale (Apartments) (Assurance of Investments of Purchasers of Apartments) Law - 1973)

hope this made this clear.