רמבם, ספר מורה הנבוכים חלק ב פרק ו
וכבר ידעת שענין מלאך שליח, וכל עושה מעשה מצוה הוא מלאך
But "angel" means "messenger"; hence everyone that is intrusted with a certain mission [mitzvah] is an angel. [Translation by M. Friedlander. Translated from Judeo-Arabic]
Suggested Discussion Questions:
1. What is angel? What is an angel in relationship to people? To God?
2. Why is someone performing a mitzvah considered an angel?
Time Period: Medieval (Geonim through the 16th Century)