Or HaChaim on Numbers 6:24/אור החיים על במדבר ו׳:כ״ד

1 יברכך וישמרך. "May the Lord bless you and preserve you." The order of 1) the blessing, 2) preserving the people who received the blessing, means that the degree of שמירה, protection, will be commensurate with the extent of the blessing previously received. Moreover, there is an implication here that the blessing will be so comprehensive that G'd has to make a special effort that all of it will be preserved. The wording יברכך may also imply that there should be no negative side effects to this blessing such as is referred to in Deuteronomy 8,12: "lest you eat, become sated etc…. and become haughty, forgetting the Lord your G'd."