Albert Barnes Commentary 1 Chronicles 10

This chapter contains two facts not found in 1 Samuel 31:1–13: the fastening of Saul’s head in the temple of Dagon (1 Chronicles 10:10) and the burial of his bones and those of his sons under an oak (1 Chronicles 10:12). Otherwise, the narrative differs from 1 Samuel 31:1–13 only by being abbreviated (see especially 1 Chronicles 10:6–7, 11–12) and by having moral reflections attached to it (1 Chronicles 10:13–14).

All his house died together - This does not mean the whole of his family, nor even “all his sons” (see 2 Samuel 2:8–15; 2 Samuel 3:6–15; 2 Samuel 4:1–12). The phrase is perhaps an abbreviation of the expression in the parallel passage of 1 Samuel 31:6.

For his transgression - Compare 1 Chronicles 9:1. The “transgression” intended is probably the disobedience regarding Amalek, recorded in 1 Samuel 15:1–9 (compare 1 Samuel 28:17–18).