Manava Dharmashastra 6.21

6.21

kālapakvaiḥ | panasādīnāṃ agninā'pi pākaḥ kriyate tanniṣedhārtham | tadagnipakvaṃ gṛhasthasyāniṣiddham | vaikhānasaṃ nāma śāstram, yatra vānaprasthasya dharmā vihitāḥ teṣāṃ mate sthitaḥ| anyāmapi tacchāstroktāṃ caryāṃ śikṣeta |

Medhātithi’s commentary (manubhāṣya):
‘Ripened in their own season’.—The jack-fruit and some other fruits are ripened (artificially) by means of fire also; and it is with a view to exclude these that this epithet has been added. But fruits ripened by means of fire are not forbidden for the Householder.

‘Vaikhānasa’ is the name of a treatise where the duties of the Hermit are prescribed;—keeping firm on these rules;—i.e. he should seek to learn also the other details of life prescribed in that treatise.—(21).