'Promised' in the Bible

“I have not spoken in secret,In a corner of a land of darkness;I did not say to the descendants of Jacob,‘Seek Me in vain [with no benefit for yourselves].’I, the Lord, speak righteousness [the truth—trustworthy, a straightforward correlation between deeds and words],Declaring things that are upright.

“Incline your ear [to listen] and come to Me;Hear, so that your soul may live;And I will make an everlasting covenant with you,According to the faithful mercies [promised and] shown to David.

Then you will take pleasure in the Lord,And I will make you ride on the high places of the earth,And I will feed you with the [promised] heritage of Jacob your father;For the mouth of the Lord has spoken.”