एते च नियमाः सर्वे शक्यंते यदि भो द्विजाः । कर्तुं च चतुरो मासानेकस्मिन्वाऽपि कार्त्तिके
ete ca niyamāḥ sarve śakyaṃte yadi bho dvijāḥ | kartuṃ ca caturo māsānekasminvā'pi kārttike
О дважды-рождённые, если все эти обеты и правила возможно исполнить, пусть их соблюдают четыре месяца — или хотя бы один месяц, в Картику.
Skanda (deduced from Nāgarakhaṇḍa Tīrthamāhātmya didactic narration)
Even when full observance is difficult, Purāṇic dharma encourages a practicable minimum—especially Kārtika—as a concentrated opportunity for merit.
The verse glorifies sacred time (Kārtika/Cāturmāsya) within a Māhātmya discourse; no single named tirtha appears here.
Undertake the listed niyamas for the full four-month period, or at minimum observe them during the month of Kārtika.