p. 275
आचार्ययोनिमिह ये प्रविश्य भूत्वा गर्भं ब्रह्मचर्यं चरन्ति ।
In plain words
Those who come here and enter the teacher as a womb, become the child forming inside him, and live out brahmacarya —
Close to the Sanskrit
Those who, having entered here the womb that is the teacher, and having become an embryo, practise brahmacarya —