'Observing' in the Bible

Cornelius said, “Four days ago to this hour, I was praying in my house during the ninth hour (3:00-4:00 p.m.); and a man [dressed] in bright, dazzling clothing suddenly stood before me,

and when I had fixed my gaze on it and was observing it I saw the four-footed animals of the earth and the wild beasts and the crawling creatures and the birds of the air.

and heard Paul speaking. After observing him closely and seeing that he had faith to be healed,

For as I was passing through and observing the objects of your worship, I even found an altar on which was inscribed: TO AN UNKNOWN GOD. Therefore, what you worship in ignorance, this I proclaim to you.

Take these men, purify yourself along with them, and pay for them to get their heads shaved. Then everyone will know that what they were told about you amounts to nothing, but that you yourself are also careful about observing the law.