The tabernacle, and courtyard and priest clothes and the clear oil of pressed lives for the light

 Exodus 27-28

“Build an altar of acacia wood, three cubits high; it is to be square, five cubits long and five cubits wide. Make a horn at each of the four corners, so that the horns and the altar are of one piece, and overlay the altar with bronze. Make all its utensils of bronze—its pots to remove the ashes, and its shovels, sprinkling bowls, meat forks and firepans. Make a grating for it, a bronze network, and make a bronze ring at each of the four corners of the network.

Make a courtyard for the tabernacle. The south side shall be a hundred cubits long and is to have curtains of finely twisted linen, with twenty posts and twenty bronze bases and with silver hooks and bands on the posts. The north side shall also be a hundred cubits long and is to have curtains, with twenty posts and twenty bronze bases and with silver hooks and bands on the posts.

The west end of the courtyard shall be fifty cubits wide and have curtains, with ten posts and ten bases. On the east end, toward the sunrise, the courtyard shall also be fifty cubits wide. Curtains fifteen cubits long are to be on one side of the entrance, with three posts and three bases,

“For the entrance to the courtyard, provide a curtain twenty cubits long, of blue, purple and scarlet yarn and finely twisted linen—the work of an embroiderer—with four posts and four bases. All the posts around the courtyard are to have silver bands and hooks, and bronze bases.  The courtyard shall be a hundred cubits long and fifty cubits wide, with curtains of finely twisted linen five cubits high, and with bronze bases.

“Command the Israelites to bring you clear oil of pressed olives for the light so that the lamps may be kept burning.

Have Aaron your brother, brought to you from among the Israelites, along with his sons Nadab and Abihu, Eleazar and Ithamar, so they may serve me as priests. Make sacred garments for your brother Aaron to give him dignity and honor. Tell all the skilled workers to whom I have given wisdom in such matters that they are to make garments for Aaron, for his consecration, so he may serve me as priest. These are the garments they are to make: a breastpiece, an ephod, a robe, a woven tunic, a turban, and a sash. They are to make these sacred garments for your brother Aaron and his sons, so they may serve me as priests. Have them use gold, and blue, purple and scarlet yarn, and fine linen.

Why?
Every article that serves for the Lord must be clean and holy, and keep the place and utensils holy for the Lord.

Even the spaces around the Tabernacle are defined by the Lord.

How?

When we serve the Lord, even the services on Sunday morning in the Church, we should keep ourselves holy, and our clothing, our heart, and mind be Holy to serve the Lord.