Its lyrics are the first verse of Psalm 133, which reads, "Behold, how good and how pleasant it is for brethren to dwell together in unity!"[2]
.הִנֵּה מַה טוֹב = Hine mah tov Behold how good
וּמַה נָּעִים = uMah-Nayim and how pleasing
שֶׁבֶת אָחִים גַּם יַחַד = shevet achim gam yachad if brothers (people) could sit together in unity (in Hebrew, the masculine also includes the feminine when a mixed group of people are concerned)
Yachad is from the word Yachid which means absolute unity and has a higher connotation than just peace and harmony.
The question is asked in the Talmud, "How can you describe HaShem (God)" and the reply is "Yachid" (absolute unity).[citation needed]
It is for this reason that the word "Yachad" has a higher connotation in that it also implies unity with the Creator and not just with other people. Simply put, it implies an ascended level of universal consciousness.