it's partly a comparison/contrast scripture in context:
Before, when I was here, it was a time for peace, but now, violent times are ahead (for all Christians and Jews in Israel, due to Rome coming)...
Luke 22:36
should begin in 35 ... Jesus was here ... "Hey guys, remember when I said ..."
35 And he said unto them, When I sent you without purse, and scrip, and shoes, lacked ye any thing? And they said, Nothing.
Luke 22:36 Then said he unto them, But now, he that hath a purse, let him take it, and likewise his scrip: and he that hath no sword, let him sell his garment, and buy one
Context...
Timing... this was JUST before Jesus was going to leave them on their own and be crucified and ascend
Similar to a Father's advice as his sons leave the nest ... take care of yourselves ...
http://www.kingjamesbibleonline.org/Luke-Chapter-22/" onclick="window.open(this.href);return false;
The BrideGroom was about to leave ... the birds about to be kicked out of the nest to fend for themselves.
Matthew 9:15
And Jesus said unto them, Can the children of the bridechamber mourn, as long as the bridegroom is with them? but the days will come, when the bridegroom shall be taken from them, and then shall they fast.
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Historical cycles occur, there's a time to beat swords into ploughshares, and a time to arm up, stated in Ecclesiastes 3:8 (a time to love and a time to hate, a time for war and a time for peace.), and illustrated in both scripture and history.
The flood=
When you see the armies surrounding you, then let them which live in Judea, head for the hills.
Luke 21:20
20 And when ye shall see Jerusalem compassed with armies, then know that the desolation thereof is nigh.
21Then let them which are in Judaea flee to the mountains; and let them which are in the midst of it depart out; and let not them that are in the countries enter thereinto.
Matt 24: 15 When ye therefore shall see the abomination of desolation, spoken of by Daniel the prophet, stand in the holy place, (whoso readeth, let him understand:)
16 Then let them which be in Judaea flee into the mountains:
Zechariah 14:5
And ye shall flee to the valley of the mountains; for the valley of the mountains shall reach unto Azal: yea, ye shall flee, like as ye fled from before the earthquake in the days of Uzziah king of Judah: and the LORD my God shall come, and all the saints with thee.
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The events in the Garden of Gethsemane and the commands of Jesus there teach the Apostles nonaggression, only because Jesus had to be taken captive and give His life.
Jesus' life period on Earth mirrors Israel's history of being taken; the sacrifice ZHe made contained all elements for an acceptable one, red stuff, wood, water, hyssop etc, just as the 2 birds in Lev 14 mirrored Barabbas being set free, and the scape goat living sacrifice being set free representing those freed from sin and the remnant or those "left behind" each time Israel was taken captive ...those left behind inherited the kingdom' they, being the poor, because Babylon/Assyria took the wealthy and health captive, but left the poor weak and worthjless behind so they were saved from camptivity and inherited the kingdom, hence the poor inherit the earth.
not trying to get deep, but just illustrating that there are cycles in His life reflecting time periods of Israel's history and future, There's a time for peace, and a time for war ... to jump up like a pop goes the weasel prior to your execution when placed on the floor.
He didn't want His disciples destroyed nor fighting to keep Him from giving His life as a substitutionary sacrifice at that time while the bridegroom was present.
Yup, I carry TWO Glock 26s, it is enough.38 They [the disciples] said, "See, Lord, here are two swords."
"It is enough," he replied.
Two is 1 and 1 is none.
Summary: The night in the Garden prior to Jesus' arrest, was not the TIME to fight.
But it was the last time He'd have to tell the Apostles to arm up before the Bridegroom left.