Tantrasara (Krishnananda) 1.75

1.75

gurudīkṣāpūrvadine svaśiṣyamabhimantrayet .
darbhaśayayāṃ pariṣkṛtya śiṣyaṃ tatra niveśayet .. 72 ..
svāpamantreṇa mantrajñaḥ śiśoḥ śikhāṃ prabandhayet .
tanmantraṃ svāpasamaye paṭhedvāratrayaṃ śiśuḥ .. 73 .. śrī guroḥ
pādukāṃ dhyātvā upavāsī jitendriyaḥ . tāro hilidvayaṃ
śūlapāṇaye dviṭha īritam .. 74 .. vāratrayaṃ paṭhitvā tu upavāsī
jitendriyaḥ . śrī guroḥ pādukāṃ dhyātvā śayīta kuśaśāyane .. 75

On the day before the initiation, the guru should consecrate his disciple. Having prepared a bed of darbha grass, he should seat the disciple upon it. / The knower of mantras should bind the tuft of hair of the child (disciple) with the sleep mantra. The child should recite that mantra three times at the time of sleep. / Meditating upon the sandals of the venerable guru, fasting and with senses controlled: 'Om hili hili, to the Trident-bearer, svāhā' is uttered. / Having recited it three times, fasting and with senses controlled, meditating upon the sandals of the venerable guru, he should lie down on the kuśa-grass bed.