Psalms 133
1How very good and pleasant it is when kindred live together in unity!
2It is like the precious oil on the head, running down upon the beard, on the beard of Aaron, running down over the collar of his robes.
3It is like the dew of Hermon, which falls on the mountains of Zion. For there the Lord ordained his blessing, life forevermore.
Note: The answers above try to mostly come direct from the Bible (New Revised Standard Version - NRSV).