'Observe' in the Bible
They shall observe his duties and the duties of the entire community before the tent of assembly, to do the work of the tabernacle.
"Let the {Israelites} observe the Passover at its appointed time.
On the fourteenth day of this month {at twilight} you will perform it at its appointed time according to all its decrees; and according to all its stipulations you will observe it."
"Speak to the {Israelites}, saying, 'Each man that is unclean {by a dead person} or [is] on a far journey, you or your {descendants}, he will observe the Passover of Yahweh.
On the second month on the fourteenth day {at twilight} they will observe it; they will eat it with unleavened bread and bitter plants.
They will leave none of it until morning, and they will not break a bone in it; they will observe it according to every decree of the Passover.
But the man who [is] clean and not on a journey, and he fails to observe the Passover, that person will be cut off from the people because he did not present the offering of Yahweh on its appointed time. That man will bear his guilt.
If an alien dwells with you he will observe the Passover of Yahweh according [to] the decree of the Passover and according [to] its stipulation; thus you will have one decree for you, for the alien and for the native of the land.'"