Saravali 34.24.38

34.24.38

dāsī putraprāpti yoga jñāna
śukranavāṃśe tasminśukreṇa nirīkṣite tvapatyāni |
dāsīprabhavāni vadeccandrādapi kecidācāryāḥ ||

Knowledge of the combination for obtaining a female servant's son:
In that [fifth house] in a navāṃśa of Venus, aspected by Venus, one should declare
offspring born of a female servant; some teachers say this from the Moon as well.