"The priest replied, 'The sword of Goliath the Philistine, whom you killed in the Valley of Elah, is here wrapped in a cloth behind the ephod. If you want it, take it.'" (1 Samuel 21:9)
David goes to Nob, to Ahimelek the priest. Ahimelek is afraid: why are you alone? David lies: I am on a mission for the king. He asks for bread; the only bread is the consecrated bread, which Ahimelek gives him. He also gives him Goliath's sword: The sword of Goliath the Philistine, whom you killed in the Valley of Elah, is here wrapped in a cloth behind the ephod. If you want it, take it; there is no sword here but that one. David takes it. Then he flees to Achish king of Gath; the servants recognise him as the one they sing about. David fears and pretends to be mad, scratching on the doors and drooling on his beard. Achish sends him away.
Jesus will later cite David's eating of the consecrated bread in his defence of his disciples picking grain on the Sabbath (Matthew 12:3-4), recognising that human need can take precedence over ritual law in certain circumstances. The Catechism identifies this principle in its discussion of the hierarchy of values: the greater good (sustaining the anointed one in flight) can justify the lesser violation of ritual law (eating the showbread) (CCC 2185).
Brothers and sisters, Goliath's sword kept behind the ephod was the only sword there. The weapon of your greatest victory may be the resource available to you in your greatest need. Do not overlook what has already been proven in battle just because it is wrapped up and put aside. Take what has served you before.
Lord God, provide for your servants in flight as you provided for David at Nob. Give us the bread and the sword we need. And remind us of the victories already won when we face the need for weapons. Through Christ our Lord. Amen.