The first evidence of this custom in Meron appears in the writings of Rabbi Chaim Vital who notes that his rabbi, the holy Ari, cut his son’s hair close to Rashbi’s grave in Meron.

In our times, parents honor their friends and important people by asking them to participate in cutting their son’s hair in Meron on Lag B’Omer and by giving brochos to the child who is keeping the mitzvah of “You shall not round off the edge of your scalp” for the first time.

While cutting the hair, the family prays for the child’s success and ends by singing chapter 150 in Tehillim:

א. הַלְלוּ-יָהּ: הַלְלוּ-אֵל בְּקָדְשׁוֹ;    הַלְלוּהוּ, בִּרְקִיעַ עֻזּוֹ.
ב. הַלְלוּהוּ בִגְבוּרֹתָיו;    הַלְלוּהוּ, כְּרֹב גֻּדְלוֹ.
ג. הַלְלוּהוּ, בְּתֵקַע שׁוֹפָר;    הַלְלוּהוּ, בְּנֵבֶל וְכִנּוֹר.
ד. הַלְלוּהוּ, בְּתֹף וּמָחוֹל;    הַלְלוּהוּ, בְּמִנִּים וְעֻגָב.
ה. הַלְלוּהוּ בְצִלְצְלֵי-שָׁמַע;    הַלְלוּהוּ, בְּצִלְצְלֵי תְרוּעָה.
ו. כֹּל הַנְּשָׁמָה, תְּהַלֵּל יָהּ:            הַלְלוּ-יָהּ

After cutting the hair, some people weigh it and donate that weight in silver or gold to tzedakah as a segulah for the child’s success and long and good life.