Exodus 7:15

Get thee unto Pharaoh in the morning; lo, he goeth out unto the water; and thou shalt stand by the river’s brink against he come; and the rod which was turned to a serpent shalt thou take in thine hand.

Cross-reference

Exodus 7:10 recounts Moses and Aaron carrying out the command from 7:15—going to Pharaoh and using the staff.

Exodus 4:2-4 records the original miracle of the staff turning into a serpent, the same staff Moses is told to take in 7:15.

Exodus 8:20 repeats the same instruction to meet Pharaoh at the water, showing a pattern in Moses' confrontations.

Exodus 9:13 repeats the same morning confrontation pattern — God again instructs Moses to meet Pharaoh early with the demand to let Israel go.