Matsyapurana 102.3

102.3

darbhapāṇistu vidhinā ācāntaḥ prayataḥ śuciḥ
caturhastasamāyuktaṃ caturasraṃ samantataḥ
prakalpyāvāhayed gaṅgām ebhirmantrairvicakṣaṇaḥ //

He should put on the rings of kuśa grass and rinse his mouth with a little water—according to the prescribed form—and then with a calm mind he should conceive within a square, measuring four hands, the sacred Ganges and invoke Her there thus:—"O Ganges! Thou art born from the foot of Viṣṇu, thou art a Viṣṇu force, and loved by Viṣṇu, Thou art Viṣṇu-devatâ; ward my sins off from the time of my birth to death. The 3½ crores of tîrthas of heaven, earth and sky are absorbed in Thee, as stated by Vâyu.—3-5.