פקוד פקדתי

HT: Yosef

Before Yaakov Avinu passed away, he called his grand-daughter Serech bas Asher to him.  He had blessed her with a long life and knew that she would be the only one from his generation who would still be alive to witness the Redemption from Egypt.  He told her that when the true Redeemer arrives he will use the words פקוד פקדתי  - P'kad p'kaditi

She was instructed to keep the words a secret.

When Moshe Rabbeinu came to the zekkeinim, he told them 'Hashem told me פקוד פקדתי'.

They went with these words to Serach who told them that these are the words that signify that Geula is finally here.

The words פקוד פקדתי are also gematria תשפ״ד  -  5784

פקוד פקדתי = 784

Also see Rabbi Kessin here

When G-D approached Moshe, He said, “pokod pokaditi”—I have surely remembered = which refers to His having “remembered” the afflictions of the Jews and that He’s come to take them out. Not only that, Moshe went to the klal—community and told them this and he used that expression of “pekidah” by which they recognized him as the Mashiach because he used the “right language,” of “pekidah.”