'Observe' in the Bible

And ye shall observe this as an ordinance for thee and for thy sons for ever.

And the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations it is an everlasting covenant.

Observe what I command thee this day: behold, I will drive out before thee the Amorite, and the Canaanite, and the Hittite, and the Perizzite, and the Hivite, and the Jebusite.

And thou shalt observe the feast of weeks, of the first-fruits of wheat-harvest, And the feast of ingathering at the turn of the year.