The Bible, Song of Solomon 2:12:
The flowers appear on the earth;
the time of the singing of birds is come,
and the voice of the turtle is heard in our land;
The fig tree putteth forth her green figs,
and the vines with the tender grape give a good smell.
Arise, my love, my fair one, and come away.
Note that the biblical ‘turtle’ in fact refers to the turtledove.