'Assured' in the Bible

“But as the time of the promise was approaching which God had assured to Abraham, the people increased and multiplied in Egypt,

And [as for the fact] that He raised Him from the dead, never again to return to decay [in the grave], He has spoken in this way: ‘I will give you the holy and sure blessings of David [those blessings and mercies that were promised to him].’

But when Silas and Timothy arrived from Macedonia, Paul devoted himself entirely to the word as he emphatically assured the Jews that Jesus is the Messiah.

"Be fully assured, therefore, that this salvation--God's salvation--has now been sent to the Gentiles, and that they, at any rate, will give heed."