One verse

Srimad Bhagavatam 7.12.8

7.12.8

केशप्रसाधनोन्मर्दस्‍नपनाभ्यञ्जनादिकम् । गुरुस्त्रीभिर्युवतिभि: कारयेन्नात्मनो युवा ॥ ८ ॥

kesa-prasadhanonmarda- snapanabhyanjanadikam guru-stribhir yuvatibhih karayen natmano yuva

kesa-prasadhana
brushing the hair
unmarda
massaging the body
snapana
bathing
abhyanjana-adikam
massaging the body with oil and so on
guru-stribhih
by the wife of the spiritual master
yuvatibhih
very young
karayet
should allow to do
na
never
atmanah
for personal service
yuva
if the student is a young man.

If the wife of the spiritual master is young, a young brahmacari should not allow her to care for his hair, massage his body with oil, or bathe him with affection like a mother.