you don't have a sword, sell your cloak and buy one

First of all I will tell you about the sword in Christianity. It says in the Bible: He said to them, "But now if you have a purse, take it, and also a bag; and if you don't have a sword, sell your cloak and buy one." (Luke 22:36) This is an acclaimed quote from Jesus (May the mercy and blessings of God be upon him)