Final answer:
Abraham knew God by His personal name Yahweh, a name tied to the covenant promise of a prosperous land for the Hebrews' worship and devotion, forming the basis of the Abrahamic faiths.
Step-by-step explanation:
According to one account, Abraham knew God by His intimate personal name conventionally pronounced Yahweh. This name is derived from the Hebrew characters for the phrase “I am who I am,” which was the response God gave to the prophet Moses upon being asked for His name. In the Hebrew Bible, Abraham is depicted as entering a Covenant with Yahweh, which established a promise that in return for the Hebrews' devotion and worship, including the circumcision of all Hebrew males, they would receive a "land of milk and honey," symbolizing a place of prosperity. Furthermore, this covenant is a cornerstone in the foundation of not just Judaism but also Christianity and Islam, making these religions collectively known as the Abrahamic faiths.