Rite no. 11 / 16
उपनयन
Initiation into learning (the sacred thread)
Often called a second, spiritual birth. The child is placed in the care of a teacher and takes up the disciplined life of the student, beginning the long work of study that shapes a whole life.
Traditionally in the years of boyhood, opening the student stage.
The Laws of Manu, Ch. II (initiation & the student) — SBE Vol. 25 (1886), public domain
The Laws of Manu · trans. Georg Bühler · 1886 · Public Domain