Pit, pat, well-a-day*,
Little Robin flew away;
Where can little Robin be?
Gone into the cherry-tree.
*Welladay is an exclamation like "alas", used to express sorrow or distress.
Thanks and Acknowledgements
This rhyme can be found in The Little Mother Goose (1912), illustrated by Jessie Willcox Smith. It can also be found in The Nursery Rhymes of England, 5th edition (1886), by James Orchard Halliwell.
Illustration from The Mother Goose; Containing All The Melodies The Old Lady Ever Wrote, edited By Dame Goslin (1850), with some graphical editing by Lisa Yannucci.