Manusmriti
गर्भाष्टमेऽब्दे कुर्वीत ब्राह्मणस्यौपनायनम् । गर्भादेकादशे राज्ञो गर्भात् तु द्वादशे विशः ॥ ३६ ॥
In the eighth year after conception, one should perform the initiation (upanayana) of a Brahmana, in the eleventh after conception (that) of a Kshatriya, but in the twelfth that of a Vaisya.
english translation
garbhASTame'bde kurvIta brAhmaNasyaupanAyanam । garbhAdekAdaze rAjJo garbhAt tu dvAdaze vizaH ॥ 36 ॥
hk transliteration by Sanscriptगर्भाष्टमेऽब्दे कुर्वीत ब्राह्मणस्यौपनायनम् । गर्भादेकादशे राज्ञो गर्भात् तु द्वादशे विशः ॥ ३६ ॥
In the eighth year after conception, one should perform the initiation (upanayana) of a Brahmana, in the eleventh after conception (that) of a Kshatriya, but in the twelfth that of a Vaisya.
english translation
garbhASTame'bde kurvIta brAhmaNasyaupanAyanam । garbhAdekAdaze rAjJo garbhAt tu dvAdaze vizaH ॥ 36 ॥
hk transliteration by Sanscript