וּבַיּ֣וֹם הַשְּׁמִינִ֗י יָבִא֙ שְׁתֵּ֣י תֹרִ֔ים א֥וֹ שְׁנֵ֖י בְּנֵ֣י יוֹנָ֑ה אֶל־הַכֹּהֵ֔ן אֶל־פֶּ֖תַח אֹ֥הֶל מוֹעֵֽד׃
And on the eighth day he shall bring two turtledoves, or two young pigeons, to the priest, to the door of the tent of meeting.
Read kabbalistic (mystical) interpretation of Numbers 6:10: and classical mystical sources.