1 Chronicles 10:12

all the valiant men arose and took away the body of Saul and the bodies of his sons and brought them to Jabesh and buried their bones under the oak in Jabesh and fasted seven days.

Genesis 35:8

Then Deborah, Rebekah's nurse, died, and she was buried beneath Bethel under an oak, and the name of it was called Allonbachuth.

Genesis 50:10

And they came to the threshingfloor of Atad, which is beyond Jordan, and there they mourned with a great and very sore lamentation; and Joseph made a mourning for his father seven days.

2 Samuel 3:35

And when all the people came to cause David to eat food while it was yet day, David swore, saying, So do God to me, and more also if I taste bread or anything else until the sun is down.

2 Samuel 21:12-14

Then David went and took the bones of Saul and the bones of Jonathan, his son, from the men of Jabeshgilead, who had stolen them from the plaza of Bethshan where the Philistines had hanged them, when the Philistines had slain Saul in Gilboa;

Treasury of Scripture Knowledge

Summary

They arose, all the valiant men, and took away the body of Saul, and the bodies of his sons, and brought them to Jabesh, and buried their bones under the oak in Jabesh, and fasted seven days.

Bible References

The oak

Genesis 35:8
Then Deborah, Rebekah's nurse, died, and she was buried beneath Bethel under an oak, and the name of it was called Allonbachuth.
2 Samuel 21:12
Then David went and took the bones of Saul and the bones of Jonathan, his son, from the men of Jabeshgilead, who had stolen them from the plaza of Bethshan where the Philistines had hanged them, when the Philistines had slain Saul in Gilboa;

Fasted

Genesis 50:10
And they came to the threshingfloor of Atad, which is beyond Jordan, and there they mourned with a great and very sore lamentation; and Joseph made a mourning for his father seven days.
2 Samuel 3:35
And when all the people came to cause David to eat food while it was yet day, David swore, saying, So do God to me, and more also if I taste bread or anything else until the sun is down.