Komentarz do Diwrej ha-jamim II 3:17

before the Heichal At the entrance of the Heichal on the outside, in the vestibule, as is proven in I Kings (7:19): “And the chapiters that were upon the top of the pillars were of lily work in the vestibule.”

one from the right of the entrance.

and one from the left of the entrance.

Jachin, etc. Boaz Jachin because of the kingdom of the house of David, which was compared to the moon, as it is written (Ps. 89:38): “Like the moon, which is established (יִכּוֹן) forever.”

Boaz, corresponding to the sun, [which emerges with might and strength (עֹז) (Yesod Veshoresh Haavodah)], as it is written (ibid. 19: 6): “it rejoices like a mighty man, running,” (Midrassh Tadshe, ch. 2). The “beth” of בֹּעַז is like the “mem” in (Gen. 5:29) נֹחַ יְנַחֲמֵנוּ and in (I Sam 1:20) שְּׁמוּאֵל כִּי מֵה' שְׁאִלְתִּיו.

and he named the right one Jachin although the moon is smaller than the sun, i.e., that it shou ld help him like an established moon, but not like a diminishing moon. Said Solomon, “If the Holy One, blessed be He, compares my kingdom to the sun and the moon, I too shall make an established and enduring thing, namely, large copper pillars.” Another explanation: Huram, who was one of the sons of Dan, made the pillars. He called one Jachin after his father Samson, about whom Scripture states (Jud. 16:29): “And Samson grasped the two pillars of the center, etc.” And Solomon called the second one Boaz after his grandfather, Boaz. A similar instance is (Gen. 31:47): “And Laban called it Yegar Sahadutha.”