Exodus 4:8-9 ▼

8 “And it shall come about that if they will not believe you or heed the witness of the first sign, they may believe the witness of the last sign.

9 “But it shall be that if they will not believe even these two signs or heed what you say, then you shall take some water from the Nile and pour it on the dry ground; and the water which you take from the Nile will become blood on the dry ground.”