Who said, "If I perish, I perish!"?

Answer: Esther

After asking the Jews of Susa to fast, Esther resolved to go to the king unsummoned, even though it was against the law.

““Go and assemble all the Jews who can be found in Susa, and fast for me. Do not eat or drink for three days, night or day, and I and my maidens will fast as you do. After that, I will go to the king, even though it is against the law. And if I perish, I perish!””— Esther 4:16 (BSB)