§ 325 Oath to other jurors.

Here's a plain English summary of this rule.

When a grand jury is formed, the foreman takes an oath first. Right after that, the other jurors on the panel take their own oath. This second oath basically tells the other jurors that they must keep the same promise the foreman just made.

In simple terms, everyone on the grand jury has to agree to do their job honestly and fairly. The oath makes sure each juror, not just the foreman, is bound by the same duty. This keeps the process consistent so all members of the grand jury are held to the same standard from the very start.