לְדָוִ֗ד מַ֫שְׂכִּ֥יל אַשְׁרֵ֥י נְֽשׂוּי־פֶּ֗שַׁע כְּס֣וּי חֲטָאָֽה׃
[A Psalm] of David. Maschil. Happy is he whose transgression is forgiven, whose sin is pardoned.
Rashi on Psalms
Of David, a maskil The Sages said (Pes. 117a): Every Psalm in which “maskil” is mentioned was said through an interpreter.
Rashi on Psalms
Praiseworthy is he whose transgression is forgiven Whose transgression the Holy One, Blessed Be He, forgives, and He conceals his sins.
Rashi on Psalms
(נשוי is anpardone in Old French, pardoned. The implication is forgiveness, because the forgiveness of iniquity represents [the sin] being lifted up and withdrawn from upon a person.)