“Then Satan stood against Israel and incited David to number Israel.”
This is one of the few places in the Old Testament where Satan is explicitly named acting against God's people.
The king who trusted the Lord so completely in earlier battles fell right into the temptation to trust numbers and his own strength.
Numbering the army looked like prudent administration, but it hid a desire to measure security by human strength, not by God.
Satan incites, but David decides — outside incitement doesn't remove responsibility for the choice David made with his heart.
Even Joab, a general hardened by war, questioned the order — sometimes the warning comes from whom we least expect to hear it.
Act: identify one whisper of pride or security-in-numbers you've felt today, and hand it over to God before you act on it.