Commentary for Joshua 22:27

כִּי֩ עֵ֨ד ה֜וּא בֵּינֵ֣ינוּ וּבֵינֵיכֶ֗ם וּבֵ֣ין דֹּרוֹתֵינוּ֮ אַחֲרֵינוּ֒ לַעֲבֹ֞ד אֶת־עֲבֹדַ֤ת יְהוָה֙ לְפָנָ֔יו בְּעֹלוֹתֵ֥ינוּ וּבִזְבָחֵ֖ינוּ וּבִשְׁלָמֵ֑ינוּ וְלֹא־יֹאמְר֨וּ בְנֵיכֶ֤ם מָחָר֙ לְבָנֵ֔ינוּ אֵין־לָכֶ֥ם חֵ֖לֶק בַּיהוָֽה׃

but it shall be a witness between us and you, and between our generations after us, that we may do the service of the LORD before Him with our burnt-offerings, and with our sacrifices, and with our peace-offerings; that your children may not say to our children in time to come: Ye have no portion in the LORD.

Rashi on Joshua