The poor has it, rich don’t; it is good than god  but worst than devil; if you eat it you will die!

Now tell me what it is...

Nothing.

Nothing' is better than GOD.
Nothing is worse than devil.
The poor has nothing.
The rich need nothing.
And if you eat nothing, you'll die.

You got it.

Another one:

I am here but when you call me I disappear: Tell me who I am!

Si senor, you did it.

Here is a traditional and that my granny used to share to me. It's in Nepali:

माथीबाट आयो सक्रम शाही तलबाट आयो पाचैँ भाई,

सक्रम शाही ले पाचैँ भाई को तक्रम पाई!