May HASHEM bless you and guard you.
May HASHEM light up [God’s] face to you and grant grace to you.
May HASHEM lift up [God’s] face to you and give you peace.
Why does the priestly blessing — Bamidbar/Numbers 6:22-26 — end with “…and give you peace.”?
One traditional response is that blessings are worthless without peace in which to enjoy them. This is perhaps why the final verse of the last tractate, Uktzin [(fruit) Stalks], of the last order, Tahorot [Cleanness]), of the Mishnah concern this topic:
Rabbi Shimon ben Halafta said: The Holy One, blessed be He, found that no vessel can contain blessing for Israel except that of peace. As it is stated: “The Lord gives strength to His people; the Lord blesses His people with peace” (Tehilim [Psalms] 29:11). (Uktzin 3:12)
See also Great Source(s) regarding this blessing.