That is an old military expression and it goes hand in hand with our Second Amendment Rights.
Now watch the stones fly.
Luke 22:35-36 (ESV)
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35 [/SUP] And he said to them,
“When I sent you out with no moneybag or knapsack or sandals, did you lack anything?” They said, “Nothing.”
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36 [/SUP] He said to them,
“But now let the one who has a moneybag take it, and likewise a knapsack. And let the one who has no sword sell his cloak and buy one.
1 Chronicles 21:27 (NASB)
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27 [/SUP] The LORD commanded the angel, and he put his sword back in its sheath.
{HE did NOT tell him to throw it away.}
John 18:10-11 (NASB)
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10 [/SUP] Simon Peter then, having a sword, drew it and struck the high priest's slave, and cut off his right ear; and the slave's name was Malchus.
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11 [/SUP] So Jesus said to Peter,
"Put the sword into the sheath {HE did NOT tell him to throw it away.}; the cup which the Father has given Me, shall I not drink it?"
The sword was the weapon of choice for self defense at the time of Christ, now it is a firearm.
THEN and NOW