וְ֠נָתְנוּ בְּנֵ֨י אַהֲרֹ֧ן הַכֹּהֵ֛ן אֵ֖שׁ עַל־הַמִּזְבֵּ֑חַ וְעָרְכ֥וּ עֵצִ֖ים עַל־הָאֵֽשׁ׃
And the sons of Aaron the priest shall put fire upon the altar, and lay wood in order upon the fire.
Read kabbalistic (mystical) interpretation of Leviticus 1:7: and classical mystical sources.