Manava Dharmashastra 3.252

3.252

ādyantayoḥ piṇḍayoreṣā pratipattiḥ | madhyamaṃ tu tatasteṣāṃ piṇḍānāṃ yo madhyamaḥ
yā na kāmārthamūḍhā | patireva mayā paricaraṇīyo manasā'pi vyabhicāro na kartavya iti yasyā niyamaḥ sā pativratā patibhaktā | pitṛpūjane śrāddhādikarmaṇi tatparā śraddhāvatī | prayatnena tadārādhanādau pravartate |

Medhātithi’s commentary (manubhāṣya):
The modes of disposal mentioned above apply to the first and the last balls; but the middlemost of the balls the lawful wife, desiring a son, should eat; i.e., the wife who has not been married merely for the sake of pleasure.

‘Devoted to her husband;’—one who makes it her vow that—‘I shall serve my husband alone, even in my mind I shall never entertain even a thought of faithlessness to him.’

‘Intent upon’—with full faith in—‘the worshipping’—the śrāddha and other rites—‘of the Pitṛs.’ That is, she betakes herself with great care to the performance of these.