Charles Ellicott Commentary 2 Samuel 6:18

"And when David had made an end of offering the burnt-offering and the peace-offerings, he blessed the people in the name of Jehovah of hosts." — 2 Samuel 6:18 (ASV)

Peace offerings. —While the “burnt offerings” were dedicatory, the peace offerings were eucharistic, and were also intended here, as in 1 Kings 8:62–65, to supply the needs of the people by a religious feast of communion with God.

He blessed the people. —As Solomon did at the dedication of the temple (1 Kings 8:14; 1 Kings 8:55), and in both cases this was especially fitting; but such blessing is by no means to be mistaken for the special priestly blessing for which the form was prescribed in Numbers 6:22-26.