Chapter 27 continues with the regulations for the tabernacle. Its first 18 verses deal with the altar of sacrifice. The brass (bronze) altar upon which animal sacrifices were completely burned, was located in front of the entrance of the tabernacle, pictures Christ's cross on Calvary, as our whole burnt sin offering, our divine-human Redeemer offered Himself without spot to God for the sin of the world.
Hebrews 9:14 "How much more shall the blood of Christ, who through the eternal Spirit offered Himself without spot to God, purge your conscience from dead works to serve the living God."
The horns of the altar (Exodus 27:2 ) were intended to be grasped (1 Kings 1:50, 2:28 ). So when faith lays hold on Christ the crucified Saviour, security is provided. The horns represent love as well as faith. They were the means by which the sacrifice is bound to the altar. (Psalm 118:27 ). It was the love of the Saviour that bound Him to the cross. So love for the Saviour binds the saved sinner to the altar of consecrated service.
The outercourt of the tabernacle was the outermost enclosure of all. It was open and exposed to the weather, in contrast to the Holy Place which was covered in. It points to the outward life and organisation of the church in the world. The outer court was 150 feet by 75 feet surrounded by sides consisting of four things:
This always speaks of righteousness - either of the saints (Revelation 19:8 ) or angels (Revelation 15:6,7 ), or the high priest, (Leviticus 16:4 ) or Christ (1 John 2:1 ). The church in the world is surrounded by a righteous, holy God who abominates sin.
Possibly of shittim wood (KJV), referred to by the Septuagint as "incorruptible wood." (Exodus 26:32,37 ). Its durability points to an unchanging God. The church in the world is surrounded by the great 'I AM' unchanging God - the same yesterday, today, and forever.
Silver was used by the Israelites as a ransom for their souls (Exodus 30:12-16 ). Note, half a shekel was a piece of silver. (Exodus 38:25-27 ). So the silver band speaks of redemption. The church in the world is surrounded by a redeeming God.
Brass speaks of great strength. We read of brazen bars (1 Kings 4:13 NIV ). Brazen walls (Jeremiah 1:18 ). Brazen shoes (Deuteronomy 33:25 ). Brazen fetters (Judges 16:21 ). Brazen helmets (1 Samuel 17:5 ). All speaking of strength. The church in the world is surrounded by a strong God. The church, though exposed to storms - wind - fierce sun, that is, opposition, trials, testing, it endures because it is enclosed by a holy, unchanging, redeeming, mighty God. And in God, does and will triumph.
These last two verses of chapter 27 deal with the oil for light. No command to make, because oil olive is a natural product - instead it had to be brought. The oil speaks of Holy Spirit as the light and life of the church as of every believer. Pressed olives speak of the fact that the Spirit was not given in power and light to the church until Jesus was glorified (John 7:39 ). Individual believers are the lamp of the local church. They are commanded to keep being filled with the Spirit (Ephesians 5:18 ) so that the light may never go out.

What is suggested by the outermost enclosure being open and exposed to the weather (John 16:33; 1 Thessalonians 3:4 )?
What truth is illustrated by the bands of silver on the tops of the pillars that surround the outermost enclosure (Exodus 30:12-16 )?
What is significant in the bringing of "pure oil of pressed olives for the light" (Exodus 27:20 )?