Mourning for the Dead: Fasting
Source: Nav
1 Samuel 31:13
Then they took their bones and buried them under the tamarisk tree in Jabesh, and they fasted seven days.
2 Samuel 1:12
They mourned and wept and fasted until evening for Saul and his son Jonathan, and for the people of the LORD and the house of Israel, because they had fallen by the sword.
2 Samuel 3:35
Then all the people came and urged David to eat something while it was still day, but David took an oath, saying, “May God punish me, and ever so severely, if I taste bread or anything else before the sun sets!”