'Truly' in the Bible

“If Cain is avenged sevenfold [as the Lord said he would be],Then Lamech [will be avenged] seventy-sevenfold.”

Besides, she actually is my [half] sister; she is the daughter of my father [Terah], but not of my mother; and she became my wife.

So now if you are going to show kindness and truth to my master [being faithful to him], tell me; and if not, tell me, that I may turn to the right or to the left [and go on my way].”

Jacob replied, “No, please, if now I have found favor in your sight, then accept my gift [as a blessing] from my hand, for I see your face as if I had seen the face of God, and you have received me favorably.

For in fact I was taken (stolen) from the land of the Hebrews by [unlawful] force, and even here I have done nothing for which they should put me in the dungeon.”

And they said to one another, “Truly we are guilty regarding our brother [Joseph], because we saw the distress and anguish of his soul when he pleaded with us [to let him go], yet we would not listen [to his cry]; so this distress and anguish has come on us.”

and said, “Oh, my lord, we indeed came down here the first time to buy food;