'Observeth' in the Bible

Is not this that with which my lord drinketh? and he observeth diligently with it; ye have done evil in that which ye have done.'

Who is wise, and observeth these? They understand the kind acts of Jehovah!

Whoso observeth the law is a son that hath understanding; but he that is a companion of profligates bringeth shame to his father.

He that observeth the wind shall not sow; and he that regardeth the clouds shall not reap.