Numbers 7:21 Kabbalah

פַּ֣ר אֶחָ֞ד בֶּן־בָּקָ֗ר אַ֧יִל אֶחָ֛ד כֶּֽבֶשׂ־אֶחָ֥ד בֶּן־שְׁנָת֖וֹ לְעֹלָֽה׃

one young bullock, one ram, one he-lamb of the first year, for a burnt-offering;

Read kabbalistic (mystical) interpretation of Numbers 7:21: and classical mystical sources.