Tafsiran Bilangan 5:7: Rashi, Or HaChaim, Rashbam & Siftei Chakhamim

וְהִתְוַדּ֗וּ אֶֽת־חַטָּאתָם֮ אֲשֶׁ֣ר עָשׂוּ֒ וְהֵשִׁ֤יב אֶת־אֲשָׁמוֹ֙ בְּרֹאשׁ֔וֹ וַחֲמִישִׁת֖וֹ יֹסֵ֣ף עָלָ֑יו וְנָתַ֕ן לַאֲשֶׁ֖ר אָשַׁ֥ם לֽוֹ׃

maka mereka harus mengakui dosa yang telah mereka lakukan, dan ia harus mengembalikan penuh apa yang menjadi kesalahannya, ditambah seperlima dari nilainya, lalu memberikannya kepada orang yang terhadapnya ia bersalah.

Rashi

את אשמו בראשו [HE SHALL RESTORE] THAT WHEREIN HE IS GUILTY, AS BEING THE CHIEF SUM — This means, he shall restore the principal about which he has sworn falsely (Bava Kamma 110a).
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Or HaChaim

והשיב את אשמו, and he shall make restitution for his guilt, etc. The Torah again switched to use of the singular although the verse had commenced by speaking about sinners in the plural confessing their guilt. The reason is that when it comes to having to confess one's guilt all sinners are in a similar situation. When it comes to making restitution, however, this is not so as the Torah makes allowances for poor people whose sin-offering consists of lower priced birds or even a meal-offering only. We have learned this in Leviticus 5,7-5,13.
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Rashbam

והשיב את אשמו, the capital value minus the penalty.
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Rashi

לאשר אשם לו [AND HE SHALL RESTORE THE PRINCIPAL … AND GIVE UNTO HIM] TO WHOM HE IS GUILTY — i.e. unto him to whom he (the claimant) owes money (Ketubot 19a).
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