וְעָשָׂ֤ה אֶת־הָֽאֶחָד֙ מִן־הַתֹּרִ֔ים א֖וֹ מִן־בְּנֵ֣י הַיּוֹנָ֑ה מֵאֲשֶׁ֥ר תַּשִּׂ֖יג יָדֽוֹ׃
And he shall offer one of the turtle-doves, or of the young pigeons, such as his means suffice for;
Read kabbalistic (mystical) interpretation of Leviticus 14:30: and classical mystical sources.