David is making the point that unity is good. He says that community between brothers (and sisters) is a good and pleasant thing, and he makes two analogies explaining why unity is to be desired. He relates unity to the oil that was poured onto the head of Aaron by Moses in Exodus 30. The oil was created from a bunch of different spices and materials, and anything the oil touched was made holy, or set apart. He also compared unity of brothers to dew, which is a common reference to life. The dew from Mount Hermon, north of Israel, would often fall on the land and bring life.
According to this Psalm, true community results in consecration and life. When we dwell in unity with the body of Christ, everything that the body touches will become sacred and set apart for the Lord, just like the oil. And just like the dew, Christian community brings life to the church.
When we enter into community with other believers, this should be our expectation. We should expect to see abundance of life, because the Lord has commanded that blessing over unity. We, as believers, should strive to create and cultivate biblical community because it is beneficial to us, and it is pleasing to God.
God, thank You that you have created us to have fellowship with one another. Thank You that You are the foundation for our unity. I pray that You would bless our community, and that You would work in our community to create life and to glorify Your name. You are a good God, so we ask that You keep doing good things. Amen!
- Hunter MacInnis