Assur in the Bible

but Paul and Barnabas told them boldly, you indeed were the first, to whom the word of God was to be preach'd: but since you reject it, and judge your own selves unworthy of eternal life, be assur'd, we shall make the same offer to the Gentiles:

therefore, pray, take something to recruit your strength: and be assur'd every one of you shall be preserv'd."