Exodus 39:3

וירקעו AND THEY DID EXTEND — וירקעו is of the same root and meaning as, (Psalms 136:6) “To Him that stretcheth out (לרקע) the earth”. Render וירקעו as the Targum does: ורדידו, they extended by beating. Plates did they beat out of the gold; in old French estendre — to extend into thin plates. Here it informs you how they wove the gold together with the woollen threads. They beat out the thin plates and from them they cut threads along the length of the plates to make of these threads a mixture (to mix them) with each of the different kind of woolen threads in the ephod and the breast-plate in regard to which gold is mentioned in this connection. One thread of gold they intertwined with six threads of blue purple, and so with each kind of wool. For all the materials had their threads six-fold, and the gold formed the seventh with each of them (cf. Yoma 72a).

And they did beat the gold into thin plates, and cut it into wires, to work it in the blue, and in the purple, and in the scarlet, and in the fine linen, the work of an artist.

וַֽיְרַקְּע֞וּ אֶת־פַּחֵ֣י הַזָּהָב֮ וְקִצֵּ֣ץ פְּתִילִם֒ לַעֲשׂ֗וֹת בְּת֤וֹךְ הַתְּכֵ֙לֶת֙ וּבְת֣וֹךְ הָֽאַרְגָּמָ֔ן וּבְת֛וֹךְ תּוֹלַ֥עַת הַשָּׁנִ֖י וּבְת֣וֹךְ הַשֵּׁ֑שׁ מַעֲשֵׂ֖ה חֹשֵֽׁב׃