The Aaronic Priestly Blessing, also known as the Birkat Kohanim, comes from Numbers 6:24-26 (NKJV).
The LORD bless you and keep you;
The LORD make His face shine upon you, And be gracious to you;
The LORD lift up His countenance upon you, And give you peace.
In Hebrew, it is written (and read from right to left) as:
יאר יהוה פניו אליך ויחנך׃
ישׂא יהוה פניו אליך וישׂם לך שׁלום׃
If you would like to listen and learn the Priestly Blessing, the Hebrew transliteration is as follows:
Ye·va·re·khe·kha Adonai ve·yish·me·re·kha.
Ya’er Adonai pa·nav e·ley·kha vi·chun·ne·kha.
Yi·sa Adonai pa·nav e·ley·kha ve·ya·sem le·kha sha·lom.