וְעָשִׂ֤יתָ מָסָךְ֙ לְפֶ֣תַח הָאֹ֔הֶל תְּכֵ֧לֶת וְאַרְגָּמָ֛ן וְתוֹלַ֥עַת שָׁנִ֖י וְשֵׁ֣שׁ מָשְׁזָ֑ר מַעֲשֵׂ֖ה רֹקֵֽם׃
And thou shalt make a screen for the door of the Tent, of blue, and purple, and scarlet, and fine twined linen, the work of the weaver in colours.
Read kabbalistic (mystical) interpretation of Exodus 26:36: and classical mystical sources.