Kaushitakagrihyasutra 5.1: prathamaḥ khaṇḍaḥ

The rites are for a living person, if [the sacrifice] is not completed and he should die.

In one-day rites, [the sacrifice] ends with death.

There is no completion of it.

When they know that one who has set up the sacred fires is dead, they keep the fires continuously burning.

Having set out the sacrificial space to the south,

such is the orientation of the kuśa grass tips.

Having laid him down on them behind the gārhapatya fire with his head to the south, between the gārhapatya and āhavanīya fires, having thus melted clarified butter over the gārhapatya fire and purified it, having taken four ladlings in the sacrificial ladle, while the deceased is held in contact [by his relation], he offers into the āhavanīya fire with the verse: "Him who has departed..."

Likewise into the gārhapatya fire;

likewise into the anvāhāryapacana fire.

Over the anvāhāryapacana fire they cook a boiled mess of grains of living plants.

Over the gārhapatya fire, curdled milk sacred to Mitra and Varuṇa.

Then, having laid him down inside an enclosure to the south, having caused the hair and nails of the deceased to be cut, bathed him, and adorned him, he should clothe him with an unwashed garment with: "This first garment has come to you from us."

Then the other [garment] is taken off with: "Take off that which you wore here before!"

His son, having put that on, should wear it until it wears out, [saying]: "Looking upon sacrifice and works of public welfare, and the sacrificial gift, as was given by you in various ways to non-relatives."