Commentary for Numbers 6:26

ישא ה' פניו אליך THE LORD LIFT UP HIS COUNTENANCE UPON THEE — This expresses the idea: May He suppress His anger (Numbers Rabbah 11:7)).

ישא ה' פניו אליך, giving you a vista of the world to come which awaits you. The line is similar in essence to what David said in Psalms 36,10 כי עמך מקור חיים באורך נראה אור, “with You is the fountain of life; by Your light do we see light.” It also reflects the statement of our sages in B’rachot 17 that in the world of the future the righteous sit with their crowned heads and enjoy the radiations of G’d’s glory.

ישא ה׳ פניו אליך, "May the Lord lift up His countenance upon you, etc." This means that in the event the deeds (sins) of the Israelites have erected some kind of barrier between them and G'd that G'd should lift this barrier and remove it. וישם לך שלום, "and may He grant you peace." The meaning of the word "peace" or "harmony" is the reverse of every kind of separation and fragmentation. Anyone examining the word carefully realises that the concept it represents is the foundation our world is built upon, the force which ensures that the "higher" world and our "lower" world can co-exist successfully. This is the mystical dimension of the words: "and they shall put My name upon the children of Israel," and the concluding words "and I will bless them."