He who spies is the one who kills.
More Irish Proverbs:
A good retreat is better than a poor fight.Irish
There is a crock of gold in the tomb of every chieftain, but they are all guarded by cats and fairies.
Irish
There is no use in carrying an umbrella if your shoes are leaking.
Irish
Three things that can't be taught: generosity, poetry and a singing voice.
Irish
Better is the trouble that follows death than the trouble that follows shame.
Irish
Don't tell your secret even to a fence.
Irish