Ganga, Jamuna, Godavari and Sarasvati make effort to touch the dust of the feet of saints. (Malar M. 4, p. 1263) It is the Guru (Ramdas), who assumed the birth and work of Machh (fish incarnation), Kachh (tortoise incamation) and Baraha (boar incarnation) and who (as Krishna) played the game of ball on the bank of Jamuna. (Swayye Mahle Chauthe Ke, p. 1403) The river Yamuna is described in the Puranas as the daughter of the sun (Surya). For sometime Krishna played on its banks. It is said that Krishna's elder brother Balarama compelled the river to change its course.
1. Kohli, Surindar Singh (ed), Dictionary of Mythological References in Guru Granth Sahib, 1993