'Steadfast' in the Bible

For thus says the Lord, “Do not enter a house of mourning, nor go to lament (express grief) or bemoan [the dead], for I have taken My peace away from this people,” says the Lord, “even My lovingkindness and compassion.

the [sound of the] voice of joy and the voice of gladness, the voice of the bridegroom and the voice of the bride, the [song-filled] voice of those who say,“Give praise and thanks to the Lord of hosts,For the Lord is good;For His [steadfast] lovingkindness (mercy) endures forever”;and of those who bring a thank offering into the house of the Lord. For I will restore the fortunes of the land as they were at first,’ says the Lord.

then I would [also] reject the descendants of Jacob and David My servant, not taking from his descendants rulers over the descendants of Abraham, Isaac, and Jacob. But I will restore their fortunes, and will have mercy on them.’”