'Observe' in the Bible
You shall observe the feast of unleavened bread; for in this same day have I brought your armies out of the land of Egypt: therefore you shall observe this day throughout your generations by an ordinance forever.
You shall observe this thing for an ordinance to you and to your sons forever.
You shall observe the feast of unleavened bread. Seven days you shall eat unleavened bread, as I commanded you, at the time appointed in the month Abib (for in it you came out from Egypt), and no one shall appear before me empty.
Therefore the children of Israel shall keep the Sabbath, to observe the Sabbath throughout their generations, for a perpetual covenant.
Observe that which I command you this day. Behold, I drive out before you the Amorite, the Canaanite, the Hittite, the Perizzite, the Hivite, and the Jebusite.
"You shall observe the feast of weeks with the first fruits of wheat harvest, and the feast of harvest at the year's end.