'Faithfulness' in the Bible

And righteousness will be the belt around His loins,And faithfulness the belt around His waist.

A throne will be established in lovingkindness,And One will sit on it in faithfulness in the tent (dynasty, family) of David;Judging and seeking justiceAnd being prompt to do righteousness.

O Lord, You are my God;I will exalt You, I will praise and give thanks to Your name;For You have done miraculous things,Plans formed long, long ago, [fulfilled] with perfect faithfulness.

and said, “Please, O Lord, just remember how I have walked before You in faithfulness and truth, and with a whole heart [absolutely devoted to You], and have done what is good in Your sight.” And Hezekiah wept greatly.

“For Sheol cannot praise or thank You,Death cannot praise You and rejoice in You;Those who go down to the pit cannot hope for Your faithfulness.

“It is the living who give praise and thanks to You, as I do today;A father tells his sons about Your faithfulness.

Then said Hezekiah to Isaiah, “The word of the Lord which you have spoken is good.” For he thought, “There will be peace and faithfulness [to God’s promises to us] in my days.”

“Because he who blesses himself on the earthWill bless himself by the God of truth and faithfulness;And he who swears [an oath] on the earthWill swear by the God of truth and faithfulness;Because the former troubles are forgotten,And because they are hidden from My sight.