Mudgalapurana 8.26.19

8.26.19

māghasnānabhavaṃ puṇyamekāhena samudbhavam |
dadāmi tvāṃ mahābhāge gaccha tvaṃ nagaraṃ nijam ||

I give to you the merit arising from the Māgha bath
performed on a single day, O fortunate one; go to your own city!”