Exodus 4:9
And it shall come to pass, if they will not believe also these two signs, neither hearken unto thy voice, that thou shalt take of the water of the river, and pour it upon the dry land: and the water which thou takest out of the river shall become blood upon the dry land.
Cross-reference
Exodus 4:28
Parallel
Exodus 4:28 records Moses telling Aaron all the signs, including the water-to-blood sign from verse 9, completing the narrative.
Exodus 4:31
Parallel
In Exodus 4:31, the people believe after Moses performs the signs, fulfilling God's purpose for this sign.
Exodus 7:19
Prophetic fulfillment
Exodus 7:19 is the actual execution of the water-to-blood plague, fulfilling the instruction given here in verse 9.
Exodus 7:17
Parallel
Exodus 7:17 turns the same water-to-blood miracle into a plague on Egypt, expanding its significance.