'Observe' in the Bible
"When you assist the Hebrew women in childbirth, observe at the delivery: If it is a son, kill him, but if it is a daughter, she may live."
You must observe this event as an ordinance for you and for your children forever.
When you enter the land that the Lord will give to you, just as he said, you must observe this ceremony.
"When a foreigner lives with you and wants to observe the Passover to the Lord, all his males must be circumcised, and then he may approach and observe it, and he will be like one who is born in the land -- but no uncircumcised person may eat of it.
You are to observe the Feast of Unleavened Bread; seven days you must eat bread made without yeast, as I commanded you, at the appointed time of the month of Abib, for at that time you came out of Egypt. No one may appear before me empty-handed.
"You are also to observe the Feast of Harvest, the firstfruits of your labors that you have sown in the field, and the Feast of Ingathering at the end of the year when you have gathered in your harvest out of the field.
"You must observe the Feast of Weeks -- the firstfruits of the harvest of wheat -- and the Feast of Ingathering at the end of the year.