This is the first in a series on The Seven Festivals
The Feast of Trumpets or Rosh Hashanah (Yom Teruah)
Leviticus 23:1
Genesis 22:13
The tradition - God provided the ram. Abraham took the ram to sacrifice in place of his son, Isaac. A substitute. In Hebrew culture they would take the horn of the ram, hollow it out and use it as an instrument - a shofar (trumpet).
The theme - Abraham thought Isaac would die, but instead, God provided the sacrifice. He will now take this thing that was dead (shofar) and I will breathe in and through it - almost as if its alive.
The concept - The Hidden Lesson. Many times God is teaching us something and in the moment of us obeying we have no idea where He is headed. At a specific time He reveals the point.
Exodus 19