Mbh 3.130.1b

And O bull among men, there is another very remarkable thing connected with this place,--namely, that on the waning of every yuga, the god Siva, having the power to assume any shape at will, may be seen with Uma and his followers. In Yonder lake also people desirous of securing welfare to the family, propitiate with sacrifices the holder of the great bow Pinaka, in the month of Chaitra. And persons of devotion having passions under control, performing their ablutions in this lake, become free from sins and, without doubt, attain to the holy regions. Here is the sacred tirtha called Ujjanaka, where the holy sage Vasistha with his wife Arundhati and also the sage Yavakri obtained tranquillity. Yonder is the lake Kausava, where grown the lotuses called Kausesaya, and here also is the sacred hermitage of Rukmini, where she attained peace, after conquering that evil passion, anger. I think, O prince, that thou hast heard something about that man of meditations, Bhrigutunga. There, O king, before thee is that lofty peak. And, O foremost of kings, yonder is Vitasta, the sacred stream that absolveth men from all sins. The water of this stream is extremely cool and limpid, and it is largely used by the great sages. O prince, behold the holy rivers Jala and Upajala, on either side of the Yamuna. By performing a sacrifice here, king Usinara surpassed in greatness Indra himself. And, O descendant of Bharata, desirous of testing Usinara’s merit and also of bestowing boons on him, Indra and Agni presented themselves at his sacrificial ground. And Indra assuming the shape of a hawk, and Agni that of a pigeon, came up to that king. And the pigeon in fear of the hawk, fell upon the king’s thigh, seeking his protection.’”