O continue thy lovingkindness unto them that know thee; and thy righteousness to the upright in heart.
O continue thy loving-kindness ... that know thee - literally, 'draw out at length х mªshok (H4900)] thy loving-kindness' (cf. Psalms 85:5, the same Hebrew). They alone "know" God who love Him, and keep His commandments (1 John 2:3; 1 John 4:8; cf. Jeremiah 22:16; Titus 1:16).
Thy righteousness ... - note, Psalms 36:6. It is 'a righteous thing with God' to award "rest" to "the upright in heart" who are now "troubled," and "tribulation" to their troublers (2 Thessalonians 1:5-7).