The Blessing with the NAME...

Numbers 6:22 The Lord spoke to Moses, saying, 23 “Speak to Aaron and his sons, saying, Thus you shall bless the people of Israel: you shall say to them,
24 The Lord bless you and keep you;
25 the Lord make his face to shine upon you and be gracious to you;
26 the Lord lift up his countenance upon you and give you peace.
27 “So shall they put my name upon the people of Israel, and I will bless them.” 

God had given everything needed to set the worship of the House of Israel in order. They were told how to keep themselves pure and in proper relationship with Him.  He now gives them this special blessing, still often recited to this day, to dismiss the people as a congregation.  We know the words but often forget the reason given in the last verse above. The priests were reminding the people who they belonged to as they went out into the world. They were His people, representing Him to all other peoples around them. They were going to be blessed by HIM. They (and we) should not forget these things.