Exodus 4:31 shows the people believing, directly answering Moses' fear in 4:1—a narrative resolution.

Exodus 4:5 gives the purpose of the sign: to convince the people God appeared — directly addressing Moses' fear in 4:1.

Exodus 2:14 records the Hebrews' rejection of Moses, the root of his fear that they won't believe him in 4:1.

Exodus 3:18 promises the elders will listen, contrasting with Moses' doubt in 4:1 that they'll believe.

Exodus 3:12 had already given Moses a sign (worship on this mountain) — yet he still fears disbelief, showing a progression in doubt.

Acts 7:25 says Moses expected understanding but was rejected—directly reflects the fear in Exodus 4:1 that they wouldn't believe.

Numbers 16:28 shows Moses using a sign to prove divine sending against Korah — same need for validation as in 4:1.