2 verses have
promise
in Edition Clear Qur'an by Talal Itani / Al-Kahf (The Cave)

18:21So it was, that We caused them to be discovered, that they would know that the promise of God is true, and that of the Hour there is no doubt. As they were disputing their case among themselves, they said, “Build over them a building.” Their Lord knows best about them. Those who prevailed over their case said, “We will set up over them a place of worship.”

18:98He said, “This is a mercy from my Lord. But when the promise of my Lord comes true, He will turn it into rubble, and the promise of my Lord is always true.”