'Faithfulness' in the Bible

so that Yahweh may establish his word which he spoke concerning me, saying, 'If your sons take heed of their way, to walk before me in faithfulness, with all their heart and with all their soul, no man of yours will be cut off from the throne of Israel.'"

Then Solomon said, "You have shown great loyal love with your servant David my father, as he walked before you in faithfulness and in righteousness and in uprightness of heart with you. You have shown for him this great loyal love, and you have given a son to him who is sitting on his throne as [it is] this day.