A few weeks ago we started reading the first book of the Torah, Breishit (Genesis). It's in these stories that we meet the patriarchs and matriarchs and learn how the Ancient Israelites ended up in Egypt generations later.
A lot of "blessing" goes on in these stories. Gob blesses Abraham, Isaac blesses Jacob (a blessing Jacob steals from his brother Esau), and Jacob blesses the sons of his son Joseph, Ephraim and Menashe.
The "priestly blessing," known to many, refers to this blessing of Jacob's. It has become traditional for Jewish mothers and fathers to give their sons and daughters this blessing on Friday evenings, often right after lighting Shabbat candles.