Most Relevant Verses
Then Amalek came and fought against Israel at Rephidim. So Moses said to Joshua, "Choose men for us and go out, fight against Amalek Tomorrow I will station myself on the top of the hill with the staff of God in my hand." Joshua did as Moses told him, and fought against Amalek; and Moses, Aaron, and Hur went up to the top of the hill.
Topics on Fighting
'Thus says the LORD, "You must not go up and fight against your relatives the sons of Israel; return every man to his house, for this thing has come from Me."'" So they listened to the word of the LORD, and returned and went their way according to the word of the LORD.
Then Judah said to Simeon his brother, "Come up with me into the territory allotted me, that we may fight against the Canaanites; and I in turn will go with you into the territory allotted you." So Simeon went with him.
More Verses on Fighting
If from human motives I fought with wild beasts at Ephesus, what does it profit me? If the dead are not raised, LET US EAT AND DRINK, FOR TOMORROW WE DIE.
Fight the good fight of faith; take hold of the eternal life to which you were called, and you made the good confession in the presence of many witnesses.
What is the source of quarrels and conflicts among you? Is not the source your pleasures that wage war in your members? You lust and do not have; so you commit murder. You are envious and cannot obtain; so you fight and quarrel. You do not have because you do not ask.