Shared ground
This short scene focuses on responses and consequences after the Nile is struck (following Exodus 7:20–21). The text presents two contrasting reactions: Pharaoh dismisses the event, while ordinary Egyptians scramble for drinkable water. It also underlines that the crisis lasts: “seven days” pass after Yahweh struck the river.
Explicitly, the passage says Pharaoh’s “heart” is hardened and he does not listen; he returns home and does not take the matter seriously; the people cannot drink from the Nile and must dig for water. The result is a gap between palace decision-making and public hardship.
Where interpretation differs
1) What the magicians actually “did in like manner.” Some read this as a real replication of the sign (at least on a small scale), which Pharaoh treats as proof that nothing unique is happening. Others think it was a deceptive display or a limited effect that does not address the main problem (it does not restore the Nile or provide relief), so Pharaoh’s confidence is misplaced either way.
2) What “Pharaoh’s heart was hardened” implies. Some take the wording here mainly as describing Pharaoh’s settled condition—he is already resistant, and this verse reports it. Others emphasize Pharaoh’s own refusal in the flow of the story (he “didn’t listen,” “turned,” and “didn’t take it to heart”), seeing the hardening as shown through his choices. The passage itself stresses the outcome: he remains unmoved, consistent with what Yahweh said would happen (see Exodus 7:4).
3) Who “them” refers to. Many understand Pharaoh not listening as directed toward Moses and Aaron (the immediate opponents in the confrontation). Others think it could include ignoring the wider warning-significance of the event, not merely refusing two speakers.
Why the disagreement exists
The verse about the magicians is brief and does not specify scope (“how much” or “for how long”), so readers infer whether it was full, partial, or merely showy. Likewise, “heart was hardened” can be read as a description of state or as spotlighting culpable refusal, and “them” is a short reference that depends on how tightly one connects v.22 to the prior dialogue.
What this passage clearly contributes
The text contributes a consistent plague-pattern: a divine act, a court counter-move, and Pharaoh’s refusal, while the population suffers. It highlights that Pharaoh’s response is not neutral; he actively disengages and “does not take even this to heart.” It also emphasizes the real, extended impact: people cannot drink from the Nile (nile) and must dig for water, and the disruption continues for a full seven-day period after Yahweh struck the river.