וְטָבַ֧ל הַכֹּהֵ֛ן אֶצְבָּע֖וֹ מִן־הַדָּ֑ם וְהִזָּ֞ה שֶׁ֤בַע פְּעָמִים֙ לִפְנֵ֣י יְהוָ֔ה אֵ֖ת פְּנֵ֥י הַפָּרֹֽכֶת׃
And the priest shall dip his finger in the blood, and sprinkle it seven times before the LORD, in front of the veil.
Read kabbalistic (mystical) interpretation of Leviticus 4:17: and classical mystical sources.