the middle: the central point of a space, group, or stretch of time, and so the position of being surrounded on all sides
At its root this word marks the middle of something. Used by itself it names a center point, the spot equally far from the edges; used of a crowd or a place it means being in among others, ringed around on every side. The New Testament almost always reaches for it through a short phrase: "in the midst" places a person inside a group, "into the middle" calls someone forward to the open center, "out of the midst" pulls them away from it, and "through the midst" carries them across it.
These are not different words but one idea seen from different angles. To be in the middle of a group is to be exposed and at its heart; to step into the middle is to come into full view; to be taken out of the middle is to be removed from the scene. The same word even measures time, naming the middle of the night or the middle of the day.
The senses below sort these uses by the small phrase that frames the word, since that is what tells a reader whether someone is standing among a crowd, being summoned forward, being carried off, or being passed by.