משלי כד:כז פירוש: רש״י

Prepare...outside This refers to Scripture.

and make it fit in the field This is Mishnah.

afterwards you shall build your house This is Talmud (Sotah 44a). Another explanation according to its apparent meaning: In the beginning, buy yourself fields and vineyards, and afterwards make it fit, ועתדה, an expression concerning goats (עתודים). Stock your field with livestock, and afterwards you shall build a house, meaning that you shall take a wife.