במדבר, פרק ז׳, פסוק כ״ט

The peace offering brought by Eliab, son of Helon, consists of a carefully chosen collection of animals. Rather than a random assortment, the exact quantity of these animals carries deep symbolic meaning. The offering includes five rams, five male goats, and five yearling lambs, adding up to a total of fifteen animals. This specific number holds special significance within the offerings brought by the tribal leaders [פני דוד].

One approach explains that the number fifteen serves as a combined representation of the origins of the Israelites, symbolizing the three Patriarchs alongside the twelve tribes. Another perspective, brought in the name of [רבי יהודה החסיד], connects this number to a unique and limited window of time in history. It reflects the exact fifteen years during which all three Patriarchs—Abraham, Isaac, and Jacob—lived together in this world. This rare period of overlapping lives is viewed as the very foundation of the world's existence. By bringing exactly fifteen offerings, the intention is to awaken the powerful merit of those shared years.