Why Won't My Resource Pack update It's Textures In Minecraft?

So I have a Mac and I'm trying to make a Faithful edit where I have different swords but faithful blocks, so I replace the faithful items with the default minecraft items so it would be easier to edit. When I select my resource pack and go to the swords they haven't changed even though I edited them overwrited them saved them but nothing changed. I'm using gimp as the editor and I have all the necessary files but nothing seems to work. What am I doing wrong?