'Assuredly' in the Bible

Therefore let all the house of Israel know assuredly, that God hath made that same Jesus, whom ye have crucified, both Lord and Christ.

I have most certainly seen the oppression of My people in Egypt and have heard their groaning, and I have come down to rescue them. Now come, and I will send you to Egypt [as My messenger].’

And after he had seen the vision, immediately we endeavoured to go into Macedonia, assuredly gathering that the Lord had called us for to preach the gospel unto them.