Jaiminīya (Talavakāra) Brāhmaṇa 2-4.154

He cut off his heads with his thunderbolt.
They became birds.
The one that was for drinking soma became a francolin partridge;
therefore it is brownish, as it were,
for brownish, as it were, is Soma.
And the one that was for drinking surā became a sparrow;
therefore it chirps as if intoxicated.
And the one that was for eating food became a black partridge;
therefore it is multi-colored, as it were,
for multi-colored, as it were, is food.
Therefore, its food is this: 'the scorpion situated on a peg'.
Tvaṣṭṛ, his son having been slain, brought forth soma excluding Indra.
Indra considered: "If he excludes me from this sacrifice, I shall indeed be excluded from the sacrifice.
Come, let me kill him."

With thunderbolt in hand, he ran towards him.

Tvaṣṭṛ, falling backward, took refuge with the wives [of the gods].

He did not pursue him there.

Therefore, they offer to Tvaṣṭṛ among the wives [of the gods].

Therefore, one should not kill someone who has taken refuge with women.

Indra stepped forth.

Right between the two havirdhāna sheds, he approached the droṇakalaśa trough to purify King Soma.

Putting his mouth to the droṇakalaśa trough itself and drinking, he went away.