From here.

"There Will Come Soft Rains" is a 12-line poem by Sara Teasdale. The work was first published in the July 1918 issue of Harper's Magazine, and later included in her 1920 collection Flame and Shadow. (wikipedia)

There Will Come Soft Rains

There will come soft rains and the smell of the ground,
And swallows circling with their shimmering sound;

And frogs in the pools singing at night,
And wild plum trees in tremulous white;

Robins will wear their feathery fire,
Whistling their whims on a low fence-wire;

And not one will know of the war, not one
Will care at last when it is done.

Not one would mind, neither bird nor tree,
If mankind perished utterly;

And Spring herself, when she woke at dawn
Would scarcely know that we were gone.

(from here)