Deuteronomy 16:11
וְשָׂמַחְתָּ לִפְנֵי ה’ אֱלֹקיךָ אַתָּה וּבִנְךָ וּבִתֶּךָ וְעַבְדְּךָ וַאֲמָתֶךָ וְהַלֵּוִי אֲשֶׁר בִּשְׁעָרֶיךָ וְהַגֵּר וְהַיָּתוֹם וְהָאַלְמָנָה אֲשֶׁר בְּקִרְבֶּךָ בַּמָּקוֹם אֲשֶׁר יִבְחַר ה’ אֱלֹקיךָ לְשַׁכֵּן שְׁמוֹ שָׁם
You shall rejoice before Hashem your G-d - you, your son, your daughter, your male servant, and your female servant, and the Levite who is within your gates, and the convert, and the orphan, and the widow who are among you, in the place where Hashem your G-d will choose to cause His name to dwell.
This verse is discussing the obligation to rejoice on Shavous. Rashi points out that the verse names the four members of a person’s household – his son, daughter, and male and female servants. It then names the members of G-d’s “household” – Levites, converts, orphans and widows. In effect, G-d is telling us, “If you take care of Mine, I will take care of yours.”