Exodus 7:22-25

22And the magiciansH2748 of EgyptH4714 did in like manner with their enchantments: and Pharaoh’s heartH3820 was hardened, and he hearkened not unto them; as Jehovah had spokenH1696. 23And PharaohH6547 turnedH6437 and wentH935 into his houseH1004, neither did he lay even this to heartH3820. 24And all the EgyptiansH4713 digged roundH5439 about the riverH2975 for waterH4325 to drinkH8354; for they could not drinkH8354 of the waterH4325 of the riverH2975. 25And sevenH7651 daysH3117 were fulfilled, after that Jehovah had smitten the riverH2975.