Quote the line that echoes the first sentence of the story. What is the significance of this line?

I don't know the specific line you are in search of. The story begins with:

It was in the clove of seasons, summer was dead but autumn had not yet been born, that the ibis lit in the bleeding tree.

You might consider:

How many miles it had traveled to die like this, in our yard, beneath the bleeding tree.

This line ties in the central motif of the bleeding tree.