I was asked to supply a riddle for my readers. This is difficult to do, for when one answers it, the others lose their fun of solving it. However, part of the fun is struggling to get it, and if we cannot share in that fun, it is little fun at all. So, if you already know the answer to the riddle, kindly refrain from hints and answers, so that others may enjoy themselves more.
I stood upon the shifting ground,
The words from stony lips above,
Dropped like spoken doom upon me.
First, four legs hath he,
Next, two legs hath he,
Lastly, behold, three.
If thou canst not tell me he,
Dead that instant shalt thou be.