Exodus 4:2 introduces the rod that Moses is commanded to take in 4:17 — the very same rod used for signs.

Exodus 4:3 records the first sign with the rod — turning into a serpent — one of the signs Moses is to perform with it in 4:17.

Exodus 4:20 shows Moses taking the rod as commanded in 4:17 — immediate obedience.

Exodus 7:9 shows the rod from 4:17 used to become a serpent before Pharaoh — a direct fulfillment of the sign command.

Exodus 7:19 uses the same rod to turn water to blood — another sign commanded in 4:17.

Exodus 14:16 uses the same rod to part the Red Sea — a later powerful sign fulfilling the purpose of 4:17.

Numbers 20:8 refers to the same staff, commanding Moses to use it to bring water from the rock — a later miracle with the same instrument.