זִבְח֥וּ זִבְחֵי־צֶ֑דֶק וּ֝בִטְח֗וּ אֶל־יְהוָֽה׃
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Rashi
Offer up sacrifices of righteousness Perform righteous deeds, and it will be as if you are offering up sacrifices.
Radak
Offer the sacrifices of righteousness: – Since you have done evil, behold, you need atonement; offer then to the Lord the sacrifices of righteousness so as ye repent, and not sacrifices like those of the wicked, of which it is said (Prov. 21:27), “the sacrifice of the wicked is an abomination” for they return to their wickedness after the sacrifices; therefore he says: the sacrifices of righteousness.
Ibn Ezra
Offer sacrifices of righteousness (זִבְחוּ זִבְחֵי־צֶדֶק - Zivchu zivchei tzedek): These are the Shelamim (Peace Offerings), whose designated portions for the altar (emureihem) are offered not on account of an Asham (Guilt Offering) or a Chatat (Sin Offering). [Nor are they equivalent to] an Olah (Burnt Offering) [which can be related to atonement for sinful] thoughts that arise in the heart (olah al ha-lev), which is the thought (she-hi ha-machshavah). And one cannot argue [against this distinction] from (Psalm 51:21): "Then You will delight in sacrifices of righteousness (zivchei tzedek), burnt offering (olah) and whole offering (kalil)." Because the meaning [there] is "[sacrifices of righteousness] and burnt offering," corresponding to [a list like saying] "Reuben and Simeon" [as distinct, separate entities].
Rashi
and trust in the Lord to lavish upon you goodness, and do not sin against Him for money, in the hope that you will be rewarded by Saul.