On Lag Ba'Omer, Rabbi Shimon bar Yochai was illuminated with the light of Moshiach, thereby attaining the highest level of his lifetime, and revealed it partially to his students. Hence, Lag Ba'Omer is a day of revelation of the inner aspects of the Torah. (Siddur with Chassidus of the Alter Rebbe and Talks of the Rebbe Rayatz)
The tzaddik Reb Tzvi Elimelech of Dinov (the Bnei Yisaschar), explains the custom to play bow and arrow on Lag B’Omer, according to what is written in the Zohar, that an especially bright rainbow indicates the imminent revelation of the light of Moshiach. Being this light is revealed in the Zohar to some extent, we play the bow and arrow.
From our Sages & Moshiach Now! reprinted from www.LchaimWeekly.org – LYO / NYC and The Weekly Farbrengen, Merkaz Anash
