Numbers 32:16

נבנה למקננו פה WE WILL BUILD [SHEEP FOLDS] FOR OUR CATTLE HERE — They paid more regard to their property than to their sons and daughters, because they mentioned their cattle before their children. Moses said to them, “Not so! Make the chief thing the chief thing and what is subordinate subordinate. First build cities for your little ones and afterwards enclosures for your flocks” (cf. v. 24) (Midrash Tanchuma, Matot 7).

And they came near to him, and said, We will build sheepfolds here for our cattle, and cities for our little ones:

וַיִּגְּשׁ֤וּ אֵלָיו֙ וַיֹּ֣אמְר֔וּ גִּדְרֹ֥ת צֹ֛אן נִבְנֶ֥ה לְמִקְנֵ֖נוּ פֹּ֑ה וְעָרִ֖ים לְטַפֵּֽנוּ׃