'Someone' in the Bible

But God appeared to Abimelech in a dream at night and said to him, "You are as good as dead because of the woman you have taken, for she is someone else's wife."

So Abimelech summoned Isaac and said, "She is really your wife! Why did you say, 'She is my sister'?" Isaac replied, "Because I thought someone might kill me to get her."

Stay there until your brother's anger against you subsides and he forgets what you did to him. Then I'll send someone to bring you back from there. Why should I lose both of you in one day?"