'Truly' in the Bible

Come now, go to King David and say to him, Did you not, O my lord, take an oath to me, your servant, saying, Truly Solomon your son will be king after me, seated on the seat of my kingdom? why then is Adonijah acting as king?

And she said to him, My lord, you took an oath by the Lord your God and gave your word to your servant, saying, Truly, Solomon your son will be king after me, seated on the seat of my kingdom.

Now by the living Lord, who has given me my place on the seat of David my father, and made me one of a line of kings, as he gave me his word, truly Adonijah will be put to death this day.

But is it truly possible that God may be housed on earth? see, heaven and the heaven of heavens are not wide enough to be your resting-place; how much less this house which I have made!

Give ear in heaven your living-place, and give him his desire, whatever it may be; so that all the peoples of the earth may have knowledge of your name, worshipping you as do your people Israel, and that they may see that this house which I have put up is truly named by your name.

Truly, I will see that Baasha and all his family are completely brushed away; I will make your family like the family of Jeroboam, the son of Nebat.

And Micaiah said, Truly, you will see on that day when you go into an inner room to keep yourself safe.

So when the captains of the war-carriages saw Jehoshaphat, they said, Truly, this is the king of Israel; and turning against him, they came round him, but Jehoshaphat gave a cry.