'Never Fail' in the Bible

For thus says the Lord, ‘David shall never lack a man (descendant) to sit on the throne of the house of Israel;

therefore thus says the Lord of hosts, the God of Israel, “Jonadab the son of Rechab shall never fail to have a man (descendant) to stand before Me always.”’”

Love never fails [it never fades nor ends]. But as for prophecies, they will pass away; as for tongues, they will cease; as for the gift of special knowledge, it will pass away.

Therefore, those who are ill-treated and suffer in accordance with the will of God must [continue to] do right and commit their souls [for safe-keeping] to the faithful Creator.