Leviticus 9:22 and Deuteronomy 10:8 and 21:5 mention Aaron or the other priests blessing the Israelites.
The text to be used for the blessing is specified in Numbers 6:24–26:
[May] Adonai bless you, and guard you –
יְבָרֶכְךָ יהוה, וְיִשְׁמְרֶךָ
(Yevhārēkh-khā Adhōnāy veyishmerēkhā …)
[May] Adonai make His face shine unto you, and be gracious to you –
יָאֵר יהוה פָּנָיו אֵלֶיךָ, וִיחֻנֶּךָּ
(“Yāʾēr Adhōnāy pānāw ēlekhā viḥunnékkā …)
[May] Adonai lift up His face unto you, and give to you peace –
יִשָּׂא יהוה פָּנָיו אֵלֶיךָ, וְיָשֵׂם לְךָ שָׁלוֹם
(“Yissā Adhōnāy pānāw ēlekhā viyāsēm lekhā shālōm.”)
This is the oldest known Biblical text that has been found; amulets with these verses written on them have been found in graves at Ketef Hinnom, dating from the First Temple Period.
Various interpretations of these verses connect them to the three Patriarchs; Abraham, Isaac, and Jacob, or to three attributes of God: Mercy, Courage, and Glory.
Use of the Blessing to ward off evil
Extrabiblical evidence such as the two silver Iron Age amulets found at Ketef Hinnom, contemporary Phoenician and Punic amulets and bands, and blessing inscriptions from the southern Levant have shown that the language of the Priestly Blessing derived from a broader tradition of apotropaic text, which was often inscribed on metal and worn in order to provide protection against evil.
Versions of the blessing are often found in mortuary and cultic contexts, and anticipate early Jewish commentaries that relate the blessing to death. Although specific words in the Priestly Blessing are commonly found in the Bible, the syntactic sequences in which they occur suggest parallels not to other biblical passages, but to blessing inscriptions from late Iron Age southern Levant. In particular it has been suggested that the enigmatic instruction to “put [Yhwh's] name on the Israelites” in Numbers 6:27 reflects an ancient practice of physically wearing the deity's name and blessing for protection against evil.
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