'Firm' in the Bible

All the commissioners of the kingdom, the prefects and the satraps, the counselors and the governors have consulted and agreed together that the king should establish a royal statute and enforce an injunction that anyone who petitions (prays to) any god or man besides you, O king, during the next thirty days, shall be thrown into the den of lions.

And he will enter into a binding and irrevocable covenant with the many for one week (seven years), but in the middle of the week he will stop the sacrifice and grain offering [for the remaining three and one-half years]; and on the wing of abominations will come one who makes desolate, even until the complete destruction, one that is decreed, is poured out on the one who causes the horror.”

With smooth words [of flattery and praise] he will turn to godlessness those who [are willing to] disregard the [Mosaic] covenant, but the people who [are spiritually mature and] know their God will display strength and take action [to resist].