You can't unless you have a mod.
what kind of mod
The number for the diamond sword is 276 . so put this is chat- /give (your name w/out parentheses) 276
yea minecraft
Have a sword. make an enchanting table. Have levels. Put the sword in the enchanting table. Click a available enchantment. BOOM a better sword. Bookshelfs gives you better enchantments for higher levels
Knockback is an enchantment applied to sword which knocks your opponent back when you strike it. The stronger the enchantment, the further it will be knocked back.
When putting away a sword you "sheath" it, or put it back into its sheath, usually worn on a belt or sling.
Twilight sword
destroy the painting and then put it back
It makes the sword stronger against undead foes
You can make a diamond sword in Minecraft by placing two diamonds above a stick in the crafting table.
To kill a creeper, get close to it, hit it with your sword and back up. Repeat this method until the creeper dies. You will get gunpowder from the creeper. If you have a stone or iron sword they take 4 hits. With an enchanted iron sword or normal diamond sword its 3.
You make the sword, then you go to a mob, then you can get meat or anything that it drops!
No. Jesus told Peter to put away his sword when he was being arrested. Matthew 26:52 - "Put your sword back in its place," Jesus said to him, "for all who draw the sword will die by the sword."