רַ֣ק הָעָ֔ם מְזַבְּחִ֖ים בַּבָּמ֑וֹת כִּ֠י לֹא־נִבְנָ֥ה בַ֙יִת֙ לְשֵׁ֣ם יְהוָ֔ה עַ֖ד הַיָּמִ֥ים הָהֵֽם׃ (פ)
Rashi on I Kings
Sacrificed on improvised altars. For the sake of Heaven, each [person] who so desired would build an altar on top of his roof or in his yard.4This was permitted during the period between the destruction of the Mishkan in Shilo and the construction of the Beis Hamikdosh. See Mishnayos Zevachim 14:7.