What is a re-oath??

I did my interview for a family preference immgration visa around a month ago. And now I am being told to come back to the embassy for "re-oath" to me and anyone of the my family who is above 14 year old. What does that mean? Does any one have any experience with that?

Thanks,

submitted by /u/OkCrew850
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source https://www.reddit.com/r/immigration/comments/rbnth3/what_is_a_reoath/