Exodus 17:8-13 (NLT)

8 While the people of Israel were still at Rephidim, the warriors of Amalek attacked them. 9 Moses commanded Joshua, “Choose some men to go out and fight the army of Amalek for us. Tomorrow, I will stand at the top of the hill, holding the staff of God in my hand.”

10 So Joshua did what Moses had commanded and fought the army of Amalek. Meanwhile, Moses, Aaron, and Hur climbed to the top of a nearby hill. 11 As long as Moses held up the staff in his hand, the Israelites had the advantage. But whenever he dropped his hand, the Amalekites gained the advantage. 12 Moses’ arms soon became so tired he could no longer hold them up. So Aaron and Hur found a stone for him to sit on. Then they stood on each side of Moses, holding up his hands. So his hands held steady until sunset. 13 As a result, Joshua overwhelmed the army of Amalek in battle.

Jude 3-4 (MSG)

Dear friends, I’ve dropped everything to write you about this life of salvation that we have in common. I have to write insisting—begging!—that you fight with everything you have in you for this faith entrusted to us as a gift to guard and cherish. What has happened is that some people have infiltrated our ranks (our Scriptures warned us this would happen), who beneath their pious skin are shameless scoundrels. Their design is to replace the sheer grace of our God with sheer license—which means doing away with Jesus Christ, our one and only Master.