Day and night Yin and yang Left and right A seesaw

I found a small me the other day It preached the way to salvation Starts with a new me turning over And a teeny-tiny donation

Farmer cries fowl! Poultry possession probable?

One is a common greeting you casually say, the other is bundled and stored away. They sound the same, though spelled apart, a word that lives in field and heart.

I wear a crown but rule no land, Born of water, yet in fire I stand. I start as an emerald, then bleed into gold, Or turn to a ruby if left to grow old. I have a silent guide but a screaming bite, I can hide in a popper or ignite a cold night.