Leviticus 14:26 Kabbalah

וּמִן־הַשֶּׁ֖מֶן יִצֹ֣ק הַכֹּהֵ֑ן עַל־כַּ֥ף הַכֹּהֵ֖ן הַשְּׂמָאלִֽית׃

And the priest shall pour of the oil into the palm of his own left hand.

Read kabbalistic (mystical) interpretation of Leviticus 14:26: and classical mystical sources.