Moses
Deuteronomy 15:4BSB·traditional attribution

There will be no poor among you, however, because the LORD will surely bless you in the land that the LORD your God is giving you to possess as an inheritance,

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. A law for the relief of poor debtors, such (we may suppose) as were insolvent. Every seventh year was a year of release, in which the ground rested from being tilled and servants were discharged from their services; and, among other acts of grace, this was one, that those who had borrowed money, and had not been able to pay it before...

Commenting on Deuteronomy 15:1-11

John Gill Reformed Baptist @doctorgill

Save when there shall be no poor among you,.... Then such a law could not take place, there would be no debts to be released; for this was never designed to screen rich persons from the payment of their just debts, or whoever were in a capacity of so doing, only such as were really poor, and unable to pay; and it supposes that this...

Jamieson-Fausset-Brown Reformed @jfbcommentary

Save when there shall be no poor man among you--Apparently a qualifying clause added to limit the application of the foregoing statement [Deu 15:3]; so that "the brother" to be released pointed to a poor borrower, whereas it is implied that if he were rich, the restoration of the loan might be demanded even during that year.