'Assuredly' in the Bible

Therefore behold, I, even I, will assuredly forget you and send you away from My presence, you and the city (Jerusalem) which I gave to you and to your fathers.

I will rejoice over them to do them good, and I will faithfully plant them in this land with all My heart and with all My soul.

For thus says the Lord, “Behold, those (Israel) who were not sentenced to drink the cup [of wrath] shall certainly drink it, and are you to remain unpunished? You will not be acquitted and go unpunished, but you will certainly drink [from the cup of wrath and judgment].