Genesis 12:6
5 And Abram took his wife Sarai, his nephew Lot, and all the possessions they had accumulated and the people they had acquired in Haran, and they left for the land of Canaan. They entered the land of Canaan. 6 Abram traveled through the land as far as the oak tree of Moreh at Shechem. (At that time the Canaanites were in the land.) 7 The Lord appeared to Abram and said, “To your descendants I will give this land.” So Abram built an altar there to the Lord, who had appeared to him. 8 Then he moved from there to the hill country east of Bethel and pitched his tent, with Bethel on the west and Ai on the east. There he built an altar to the Lord and worshiped the Lord.
Judges 9:5
5 He went to his father’s home in Ophrah and murdered his half brothers, the 70 legitimate sons of Jerub Baal, on one stone. Only Jotham, Jerub Baal’s youngest son, escaped, because he hid. 6 All the leaders of Shechem and Beth Millo assembled and then went and made Abimelech king by the oak near the pillar in Shechem. 7 When Jotham heard the news, he went and stood on the top of Mount Gerizim. He spoke loudly to the people below, “Listen to me, leaders of Shechem, so that God may listen to you!
Notes and References
"... In the Old Testament, trees often marked sacred sites - places of divine encounter. This particular tree marked a divine encounter at the core of Israel’s existence. Genesis 12:6–7 records that Yahweh appeared to Abram at Shechem at the oak of Mamre, where Yahweh makes the promises of the covenant. Here, Yahweh chooses Abraham and says that his offspring would be a great nation through whom all the nations would be blessed. Later Jacob buries his family’s idols at this same spot to fulfill a vow to Yahweh (Gen 35:4). Jacob’s act is no coincidence. His gesture recalls the incident that birthed Israel’s covenant relationship. The oak at Shechem became a sacred site. These events explain why the tree at Shechem was special for Joshua and the Israelites - it marked holy ground. Later, in Judges 9:5–6, Gideon’s son Abimelech was declared king “by the oak of the pillar at Shechem.” The “pillar” is a possible reference to the stela erected by Joshua before his death. This pillar appears again in Judges 9, where it is associated with divine revelation (Judges 9:34–37) ..."
Heiser, Michael S. The Bible Unfiltered: Approaching Scripture on Its Own Terms (pp. 78-79) Lexham Press, 2017