Exodus/Shemot 22:20
כ וְגֵר לֹא-תוֹנֶה, וְלֹא תִלְחָצֶנּוּ: כִּי-גֵרִים הֱיִיתֶם, בְּאֶרֶץ מִצְרָיִם.
20 You shall not wrong a stranger or oppress him, for you were strangers in the land of Egypt.
As cited in Rabbi Jill Jacobs, There Shall Be No Needy: Pursuing Social Justice through Jewish Law & Tradition (Woodstock, VT: Jewish Lights Publishing, 2010), 99.