וַיִּֽקַּֽח־ל֣וֹ יַעֲקֹ֗ב מַקַּ֥ל לִבְנֶ֛ה לַ֖ח וְל֣וּז וְעֶרְמ֑וֹן וַיְפַצֵּ֤ל בָּהֵן֙ פְּצָל֣וֹת לְבָנ֔וֹת מַחְשֹׂף֙ הַלָּבָ֔ן אֲשֶׁ֖ר עַל־הַמַּקְלֽוֹת׃
And Jacob took him rods of fresh poplar, and of the almond and of the plane-tree; and peeled white streaks in them, making the white appear which was in the rods.
Read midrashic interpretation of Genesis 30:37: and classical rabbinic exegesis.