וּמִן־הַדָּ֞ם יִתֵּ֣ן ׀ עַל־קַרְנֹ֣ת הַמִּזְבֵּ֗חַ אֲשֶׁר֙ לִפְנֵ֣י יְהוָ֔ה אֲשֶׁ֖ר בְּאֹ֣הֶל מוֹעֵ֑ד וְאֵ֣ת כָּל־הַדָּ֗ם יִשְׁפֹּךְ֙ אֶל־יְסוֹד֙ מִזְבַּ֣ח הָעֹלָ֔ה אֲשֶׁר־פֶּ֖תַח אֹ֥הֶל מוֹעֵֽד׃
Y de aquella sangre pondrá sobre los cuernos del altar que está delante de SEÑOR en el tabernáculo del testimonio, y derramará toda la sangre al pie del altar del holocausto, que está á la puerta del tabernáculo del testimonio.
Mishneh Torah, The Chosen Temple
The four corner-pieces of the altar, its base, and its squareness are all essential and any altar that does not have corner-pieces, a base, a ramp, and squareness is invalid for they are all essential, however its length, width, and height are not essential as long as it is not less than one cubit [wide] by once cubit [long] by three cubits [high] like the pyre-space of the Altar in the desert.