Poem by William Blake from his Songs of Innocence:

Merry, Merry Sparrow,
Under leaves so green,
A happy Blossom
Sees you swift as arrow
Seek your cradle narrow
Near my Bosom.

Pretty, Pretty Robin,
Under leaves so green,
A happy Blossom
Hears you sobbing, sobbing,
Pretty, Pretty Robin,
Near my Bosom.