'Keep' in the Bible

And Elisha sat in his house, and the elders sat with him. And the king sent a man before him. Before the messenger came to him, he himself said to the elders, Do ye see how this son of a murderer has sent to take away my head? See, when the messenger comes; shut the door, and keep him off with the door: is not the sound of his master's feet behind him?

and a third part shall be at the gate of Sur; and a third part at the gate behind the couriers; and ye shall keep the watch of the house for a defence.

And the two parts of you, all those that go forth on the sabbath, even they shall keep the watch of the house of Jehovah about the king.

And Jehovah testified against Israel and against Judah, by all the prophets, all the seers, saying, Turn from your evil ways, and keep my commandments, my statutes, according to all the law which I commanded your fathers, and which I sent to you through my servants the prophets.

And the king stood on the dais, and made a covenant before Jehovah, to walk after Jehovah, and to keep his commandments and his testimonies and his statutes with all his heart, and with all his soul, to establish the words of this covenant that are written in this book. And all the people stood to the covenant.