According to Jewish and Muslim tradition, it is Ur Kasdim, the birthplace of Abraham.

Entity and relation annotations:
id: 0
type: entity
value: text: Abraham
labels: <Person>
id: 1
type: entity
value: text: Ur Kasdim
labels: <Location>
type: relation
to_id: 1
labels: Person:born_in:Location
from_id: 0