'Open' in the Bible

Please, let your ear be attentive and your eyes open to hear the prayer of your servant that I am praying before you by day and by night for your servants, the {Israelites}, and confessing the sins of the {Israelites} that we have sinned against you. I and my father's house have sinned.

I stationed the people behind the deepest part of the wall in the open places according to their families, with their swords, spears, and bows.

And Sanballat sent his servant with an open letter, [another] word like this to me a fifth time, in his hand.

I said to them, "Do not open the gates of Jerusalem until the sun is hot. While they are standing guard let them shut and fasten the doors. And appoint guards from the inhabitants of Jerusalem, one at his post and another opposite his house."