Bible Riddle

I am one but you’d see three,
and people barely think of me.
But I am often on their lips,
or found beneath their fingertips.
I warrant very little thought,
but with my help billions are taught.
And while I span a space so small,
I help you see what’s one, not all.
When God’s words first appeared on scrolls,
I was not found among their roles.
But in God’s word I’m now throughout,
to help you his will learn about.
Read just his first verse and his last,
and you’ve seen me there six times fast.
In fact this verse is one of few,
in which I’m not found through and through.
Although it’s true I’m found in “there”
but you will never see me here.