Parashas Ki Sisa · Passuk 33:19
Torah Temimah points to classical source on this unit (verified).
English: “I will be gracious to whom I will be gracious” — the attribute of mercy.
Derash on Hashem’s free bestowal of favor and mercy.
I will make all My goodness pass before you, and I will proclaim the name of Hashem before you; and I will be gracious to whom I will be gracious, and I will show mercy to whom I will show mercy.