Vaishnava Dharmashastra 89.4

89.4

kārttikaṃ sakalaṃ māsaṃ nityasnāyī jitendriyaḥ
japan haviṣyabhugdāntaḥ sarvapāpaiḥ pramucyate //

He who bathes (at the prescribed time, early in the morning) constantly, during the whole month Kârttika, who keeps his organs of sense under control, who mutters (the Gâyatrî), who eats food fit for oblations only, and who governs his passions, is purified from every sin.