'Power' in the Bible

And Abner was very angry at the words of Ish-bosheth, and he said, Am I a dog's head of Judah? I am this day doing all in my power for the cause of your father Saul and for his brothers and his friends, and have not given you up into the hands of David, and now you say I have done wrong with a woman.

And David and all the men of Israel made melody before the Lord with all their power, with songs and with corded instruments and instruments of brass.

And David overcame Hadadezer, the son of Rehob, king of Zobah, when he went to make his power seen by the River.

For the king will give ear, and take his servant out of the power of the man whose purpose is the destruction of me and my son together from the heritage of God.

And the Gibeonites said to him, It is not a question of silver and gold between us and Saul or his family; and it is not in our power to put to death any man in Israel. And he said, Say, then, what am I to do for you?