The LORD gave Aaron and his sons specific words to bless Israel: “The LORD bless you and keep you… the LORD lift up his countenance upon you and give you peace.” The passage says this is how God’s name was put upon the people. See Numbers 6:22–27.
In Numbers 6:22–27, Yahweh instructs Moses to tell Aaron and his sons to pronounce a set blessing over Israel. The blessing is spoken directly to the people in three lines, each asking Yahweh to act for their good: to bless and protect, to look on them with favor and show grace, and to look toward them and grant peace. This passage sits within a larger set of instructions about maintaining Israel’s ordered life around Yahweh’s dwelling among them.
This passage presents a blessing as authorized speech given by Yahweh and delivered through Israel’s priests (Aaron and his sons). The words are fixed and repeatable rather than improvised. The blessing is aimed at the whole community (“the children of Israel”), not at a private spiritual elite.
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with Numbers 6:22-27, then read the surrounding section so the answer stays connected to the passage's flow.
22Yahweh spoke to Moses, saying,
23Speak to Aaron and to his sons, saying, On this wise you shall bless the children of Israel: you shall tell them,
24Yahweh bless you, and keep you:
25Yahweh make his face to shine on you, and be gracious to you:
26Yahweh lift up his face toward you, and give you peace.
27So shall they put my name on the children of Israel; and I will bless them.