King James Version (KJV)
Mercy and truth preserve the king: and his throne is upholden by mercy.
Modern English
Steadfast love and faithfulness preserve the king, and by steadfast love his throne is upheld.
Hebrew
חֶ֣סֶד וֶ֭אֱמֶת יִצְּר֣וּ מֶ֑לֶךְ וְסָעַ֥ד בַּ֝חֶ֗סֶד כִּסְאֽוֹ׃
ḥesed veʾemet yiṣrv melek vsaʿad baḥesed kisʾvo