Exodus 26:14

מכסה לאהל [AND THOU SHALT MAKE] A COVERING FOR THE אהל — For that roofing of goats’ hair (which is termed אהל in this section) make still another covering of rams’ skins dyed red, and above this also a covering of Tachash skins. These uppermost covers however covered the roof only (were not hanging over the sides), their length being 30 cubits and their width 10. This is the opinion of R. Nehemia (that the goats’ skins and the layer of rams’ and Tachash skins formed two different covers one above the other); according to R. Jehudah, however, there was only one cover, half of it being of rams’ skins dyed red and half of it of Tachash skins (cf. Shabbat 28a).

וְעָשִׂ֤יתָ מִכְסֶה֙ לָאֹ֔הֶל עֹרֹ֥ת אֵילִ֖ם מְאׇדָּמִ֑ים וּמִכְסֵ֛ה עֹרֹ֥ת תְּחָשִׁ֖ים מִלְמָֽעְלָה׃ {פ}

And thou shalt make a covering for the Tent, of rams’ skins dyed red, and a covering above of taĥash skins.