This article is an exposition of Psalm 133. This brief but beautiful psalm extols the value and virtues of Christian fellowship. It is a charming and challenging psalm of David. Perhaps it was written when he became king over all Israel; or when he brought the ark to Jerusalem - thus linking it with Psalm 132. It was a very appropriate psalm for the ancient pilgrims to sing as they met in assembly with other worshippers in Jerusalem. It is still a very appropriate psalm to sing when believers gather together in fellowship.