2 Samuel 4:11

a righteous person "A man who had done no one any harm," as Josephus says. His merits seem to have been negative rather than positive.

require his blood Demand satisfaction for his murder. God is said to "require blood," i.e. to avenge murder (Genesis 9:5; Psalms 9:12), and in punishing the murderers David acted as His representative.

take you away from the earth Rather, put you away out of the land. The word is one specially used of removing evil or the guilt of evil from the land (Deuteronomy 19:13; Deuteronomy 19:19, &c.). The guilt of murder defiled the land until expiated by the execution of the murderer (Numbers 35:33).