'Observed' in the Bible

Then Harbonah, one of the eunuchs attending the king, observed, "Look there! A pole is standing 50 cubits high at Haman's house that he prepared for Mordecai, whose report benefitted the king!"

These days should be remembered and observed in every generation by each family in every province and town. These days of Purim should not be neglected by the Jewish people, and that they should not be forgotten by their descendants.

to establish these days of Purim [to be observed] at their appointed times, just as Mordecai the Jew and Queen Esther had established for them, and as they had established for themselves and for their descendants with instructions regarding their times of fasting and their lamentations (expressions of needing help).