It was anciently believed that the sun was in Aries when the earth was created, and for this reason Aries was always considered the first of the twelve signs of the Zodiac. The Hebrews associated it with their month Nisan, the first month of their religious year, the month of the Passover when they escaped from slavery in Egypt. Moses instructed each family to kill a lamb and mark the lintel and doorposts of their houses with its blood. When the death angel came through the land destroying every firstborn son, he passed over the houses thus protected, Exodus 12.
Aries and the Passover prefigure Messiah whose shed blood protects from death and eternal damnation. The Creator knowing that mankind would rebel, planned in advance to make provision for our salvation. "Behold, the Lamb of God who takes away the sin of the world," the forerunner said of Jesus, John 1:29.
Aries marks the beginning of a new year, a new life. Through Messiah's sacrifice, God is building a new creation. "Therefore, if anyone is in Christ, he is a new creation. The old has passed away; behold, the new has come," 2 Corinthians 5:17.