'Observe' in the Bible

When the rainbow is in the clouds, I will observe it and remember the everlasting covenant between God and all living beings on the earth."

Here is my covenant that you are to observe, between me and you and your descendants: Every male among you is to be circumcised.

Then he said, 'Observe that all the male goats mating with the flock are streaked, speckled, or spotted, for I have observed all that Laban has done to you.

Joseph remembered the dreams he had dreamed about them, and said to them, “You are spies; you have come [with a malicious purpose] to observe the undefended parts of our land.”

and Joseph saith to them, 'What is this deed that ye have done? have ye not known that a man like me doth diligently observe?'