'Stedfast' in the Bible

Now, O Jehovah God, is Thy word with David my father stedfast, for Thou hast caused me to reign over a people numerous as the dust of the earth;

'And now, O Jehovah, God of Israel, is Thy word stedfast that Thou hast spoken to Thy servant, to David,

And they rise early in the morning, and go out to the wilderness of Tekoa, and in their going out Jehoshaphat hath stood and saith, 'Hear me, O Judah, and inhabitants of Jerusalem, remain stedfast in Jehovah your God, and be stedfast; remain stedfast in His prophets, and prosper.'