Psalm 133: a vision of social harmony

I’ve loved the words of this psalm ever since I sang them in a church anthem as a boy (I still remember how it goes). Now it speaks to me of a redeemed world of peace and unity between those of different cultures and faiths:
Behold how good and pleasant it is ♦ to dwell together in unity.
2 It is like the precious oil upon the head, ♦ running down upon the beard,
3 Even on Aaron’s beard, ♦ running down upon the collar of his clothing.
4 It is like the dew of Hermon ♦ running down upon the hills of Zion.
5 For there the Lord has promised his blessing: ♦ even life for evermore.