Regarding the rejoicing on Lag B'omer ... there are divergent opinions as to whether we should begin rejoicing only in the daytime, or perhaps the previous night? With the arrival of hod shebehod ... We can further clarify and determine this issue, based on the famed discourse published in the Siddur [with Chassidic explanation] that addresses the spiritual superiority of Lag B'omer:
It is on Lag B'omer that we complete the process of refining the specific sefiros (attributes), from the first sefirah through hod shebehod – "the completion and conclusion of the main body of the attributes." [See above, fn. 22.] This completion is initially achieved on the eve of Lag B'omer ... during the Ma'ariv prayer ... at the moment we recite (according to the prayer text established by the Alter Rebbe), "In the merit of counting the omer ... may it be rectified ... the sefirah of hod shebehod."
Then, following the beginning of this process on the eve of Lag B'omer, it continues and increases throughout the entire following day. [The rectification of hod shebehod and by extension, the "main body" of the attributes, begins at nightfall, steadily progresses throughout the day, and is finalized at the following nightfall]. However, even the night following that ... (especially before the hour of midnight) still receives some influence from its proximity to Lag B'omer.
