Agni brings the gods' command to the three brothers, who first deny blaming the cup and praise its wood. They list their other tasks, then debate two, three or four cups; the youngest's four is done. Tvashtri approves the plan in one hymn; in another he hides among the gods' wives and proposes killing them. The brothers take new names, go up to the gods and get the third pressing of Soma.
The Ribhus won Soma-drinking among the gods by austerity. Agni with the Vasus drove them from the morning pressing, Indra with the Rudras from midday, the All-gods from the evening. Prajapati told Savitr, whose pupils they were, to drink with them; Savitr asked Prajapati to drink on both sides of them. The gods still loathed their human scent, so two verses are inserted round their hymn. Elsewhere Prajapati as father makes the mortal Ribhus immortal.
What is different here:
Austerity, not craft, earns the share; the gods resist; the 'human scent'; no cup and no Tvashtri.
Ribhu, Vibhvan and Vaja, sons of Sudhanvan son of Angiras, become pupils of Tvashtri, who teaches them all his arts. Challenged by the All-gods, they make vehicles and weapons for every god: Brihaspati's cow, the Ashvins' three-seated car, Indra's bays, and at Agni's message the four cups. Tvashtri, Savitr and Prajapati summon the gods and grant them immortality; Indra drinks with them at the third pressing.
What is different here:
Makes Tvashtri their teacher and one of those who reward them; adds the challenge by the All-gods.
Sources: Hymns of the Rigveda, tr. R. T. H. Griffith (1896), hymns read for the Vedic layer; Rigveda Brahmanas: the Aitareya and Kausitaki Brahmanas, tr. A. B. Keith (1920); The Brhad-devata attributed to Saunaka, ed. and tr. A. A. Macdonell (Harvard Oriental Series 6)