'Observe' in the Bible

And Haman said to King Ahasuerus, "There is a certain people scattered and separated among the peoples in all of the provinces of your kingdom; their laws [are] different from every [other] people, and they do not {observe} the laws of the king; it is not appropriate for the king to tolerate them.

the Jews established and adopted [it] for themselves and for their offspring, and for all who joined them. They did not neglect {to observe} these two days every year as it was written and appointed to them.