Ashtangasamgraha 1.28

1.28

Combination of two and combination of all three arise from the decrease or vitiation of two or three of them;
they are described as sixfold and tenfold through permutations of predominance and the like.
And the woman, thus disposed, having her limbs anointed, with a diet dominated by sesame oil and black gram, should first mount the bed with her left foot, to the right of the man.
There, he should recite the mantra:
'You are lifespan, you are foundation everywhere, may Dhātṛ establish you, may Vidhātṛ establish you, be endowed with sacred splendour!
May Brahmā, Bṛhaspati, Viṣṇu, Soma, Sūrya, and the Aśvins,
Bhaga, and Mitrāvaruṇa give me a heroic son!'
In Pūrvāṣāḍhā, [death occurs] on the ninth; in the others, after a month.
[Medicines] that promote the downward movement of vāta, urine, feces, and the doṣas.
His kinsmen should keep vigil, bearing the greatest joy.