民数記 7:21

פר אחד ONE BULLOCK, [A YOUNG ONE, בן בקר] — in allusion to Abraham of whom it states, (Genesis 18:7) “And he took a young bull (בן בקר)" (Numbers Rabbah 13:14). איל אחד ONE RAM — in allusion to Isaac, with reference to whom Scripture states, (Genesis XXII 13) “and he (Abraham) took the ram (האיל) [and offered it up … in the stead of his son]” (Numbers Rabbah 13:14). כבש אחד ONE LAMB — in allusion to Jacob of whom Scripture states, (Genesis 30:40) “and Jacob did separate the lambs” (Numbers Rabbah 13:14).

one young bullock, one ram, one lamb of the first year, for a burnt offering:

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