The Structure at Machpelah is made of dressed Herodian stonework, much like the Western Wall of the Temple Mount. The Tombs therein house the remains of Abraham and Sarah (NOT Hagar!), Isaac(NOT Ishmael!) and Rebecca, and Jacob(NOT Esau!) and Leah. Rachel, the beloved 2nd wife of Jacob is buried in a tomb near Bethlehem, where she died in childbirth.
In a Real estate transaction, the Purchase and sale agreement has to contain three important elements:
1. A description of the Property.
2. The names of the buyer and seller.
3. The price paid for the Property.
All three of these elements for the property in question are duly registered and available for public examination in the Book of Genesis.
The temple mount agreement is also registered in the Bible.
It is the muslim who is the usurper of the property in both cases.
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Got to remember that there has been thief of Jewish/Christian landmarks under Islam.