"The Levites are to be mine. I am the LORD." (Numbers 8:14)
God instructs Aaron to set up the seven lamps to light the area in front of the lampstand. Aaron does this, just as the LORD commanded Moses. The lampstand of pure gold, with its seven lamps, is one of the most enduring symbols in all of Scripture, finding its ultimate fulfilment in the seven golden lampstands of Revelation 1, among which the risen Christ walks. The light that burned perpetually before the presence of the LORD in the tabernacle is the light of the Word himself who is the light of the world.
God then gives the ceremony for setting apart the Levites for their service. The Israelites are to lay their hands on the Levites, who are then presented before the LORD as a wave offering from the Israelites. The Levites lay their hands on the bulls; one is offered as a sin offering and one as a burnt offering to make atonement for the Levites. They are set apart from among the Israelites as the substitute for Israel's firstborn. The Levites are to be mine. I am the LORD. The laying on of hands connects this ceremony to the sacramental theology of ordination: those set apart for sacred ministry receive the imposition of hands that transfers the community's representative capacity to them (CCC 1573).
Brothers and sisters, when you attend an ordination and see the bishop lay his hands on the head of the ordinand in silence, you are watching Numbers 8 fulfilled in the new covenant. The Levites are mine, God said. The ordained belong to God in a specific way, set apart for the service of the whole community. Pray for your priests with that understanding.
Lord God, the Levites are yours, set apart for service as the substitute for your whole people. Give your Church holy priests and deacons, purified and dedicated for the service of your presence. And let the lamps before your sanctuary never go out. Through Christ our Lord. Amen.