Yama has died. The gods try to persuade Yami to forget him, and whenever they ask she says he died only today. They see that she will never forget this way and resolve to create night, for then there was only day. Night is created, a morrow arises, and she forgets him.
Maitrayani Samhita 1.5.12, the origin of night, as translated in S. K. De, Ancient Indian Erotics and Erotic Literature (1959), excerpt page; Yamuna in Hinduism (Wikipedia)
A dialogue while Yama lives. Yami asks her twin to be her husband so that the one mortal may leave offspring, saying the gods wish it and Tvashtri made them a pair in the womb. Yama refuses: the law of Mitra and Varuna is great, the gods' watchers never close their eyes, and it is called wrong. She calls him a weakling; he tells her to find another husband and wishes her a good marriage.
A different episode: an argument about marriage, not mourning; Yama is alive and has the last word. Told on the site with restraint.
Hymns of the Rigveda, tr. R. T. H. Griffith (1896), hymns read for the Vedic layer § 10.10; Hymns of the Atharva-Veda, tr. R. T. H. Griffith (1895) § 18.1.1-16
Sources: Maitrayani Samhita 1.5.12, the origin of night, as translated in S. K. De, Ancient Indian Erotics and Erotic Literature (1959), excerpt page; Yamuna in Hinduism (Wikipedia); Hymns of the Rigveda, tr. R. T. H. Griffith (1896), hymns read for the Vedic layer; Hymns of the Atharva-Veda, tr. R. T. H. Griffith (1895)
Yamuna's long-refused invitation is accepted on Karttika bright second; Yama frees the hells for the day and grants her wish for all brothers and sisters.
The childless sage Mrikandu is offered by Shiva a choice: a good son who dies at sixteen or a fool who lives long.
Singers steady themselves and call a man's spirit back for sense, strength and life.
A dove, envoy of Destruction, has come into the house and settled by the fire.
The funeral hymn gives the dead to Pushan, who knows the far road; the Isha Upanishad asks him to uncover the face of the True.
King Prithu, son of Vena, makes the Earth yield grain by milking her as a cow; told as a cosmic milking in the Atharvaveda, a friendly one in the Mahabharata and a chase in the Puranas.
The Sun's wife cannot bear his splendour.
Agni, afraid of the priestly work, hides in the waters and plants.