'Truly' in the Bible

For if you truly make your ways and your deeds good, if you truly do justice between a man and his neighbor,

Why is my pain endless, and my wound incurable? It refuses to become healed. Truly you are to me like a deceitful [brook], waters [that] are not trustworthy.

Only you must certainly know that if you put me to death, you will bring on yourselves innocent blood, and on this city and on its inhabitants, for {truly} Yahweh sent me to you to speak all these words in your ears."

The prophet who prophesies peace, at the coming of the word of the prophet, will become known [as] the prophet that Yahweh has {truly} sent."