1 Chronicles 10:12
"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."
Cross References (ranked by relevance)
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 he made a mourning for his father seven days.
2 Samuel 3:35
And when all the people came to cause David to eat meat while it was yet day, David sware, saying, So do God to me, and more also, if I taste bread, or ought else, till the sun be down.
Genesis 35:8
But Deborah Rebekah’s nurse died, and she was buried beneath Bethel under an oak: and the name of it was called Allonbachuth.