In 1 Samuel 12:7, Samuel also says 'stand still' to reason about past deeds; here he calls to see a future great thing — same phrase, same speech.

1 Samuel 12:17 immediately explains the 'great thing' — thunder and rain as a sign of God's power. It's the direct continuation.

Exodus 14:13 has Moses say 'stand firm and see the salvation of the LORD' — a direct verbal parallel to Samuel's 'stand still and see'.

Exodus 14:31 shows the result of seeing God's great work: fear and belief. This is the intended outcome of the call in 1 Samuel 12:16.