'Confirm' in the Bible

But you must remember Yahweh your God, for he [is] the [one] giving you strength to acquire wealth in order to confirm his covenant that he swore to your ancestors {as it is today}.

[It is] not because of your righteousness and because of the uprightness of your heart [that] you [are] coming to take possession of their land, but because of the wickedness of these nations Yahweh your God [is] driving them {before you}, and in order to confirm the {promise} that Yahweh swore to your ancestors, to Abraham, to Isaac, and to Jacob.