David said to Solomon his son, Be strong and of good courage, and do it: don't be afraid, nor be dismayed; for Yahweh God, even my God, is with you; he will not fail you, nor forsake you, until all the work for the service of the house of Yahweh is finished.
he will not fail thee, nor forsake thee; a promise made to Joshua, and is applicable to every good man in whatsoever good work he is concerned, Joshua 1:5,