Liṅgapurāṇa, 1-108 · Chapter 1.56

vīthyāśrayāṇi carati nakṣatrāṇi niśākaraḥ
tricakrobhayato 'śvaś ca vijñeyastasya vai rathaḥ //

śatāraiś ca tribhiścakrair yuktaḥ śuklairhayottamaiḥ
daśabhistvakṛśair divyair asaṃgais tair manojavaiḥ //

rathenānena devaiś ca pitṛbhiścaiva gacchati
somo hyambumayair gobhiḥ śuklaiḥ śuklagabhastimān //

kramate śuklapakṣādau bhāskarātparamāsthitaḥ
āpūryate parasyāntaḥ satataṃ divasakramāt //

devaiḥ pītaṃ kṣaye somam āpyāyayati nityaśaḥ
pītaṃ pañcadaśāhaṃ tu raśminaikena bhāskaraḥ //

āpūrayan suṣumnena bhāgaṃ bhāgamanukramāt
ityeṣā sūryavīryeṇa candrasyāpyāyitā tanuḥ //

sa paurṇamāsyāṃ dṛśyeta śuklaḥ sampūrṇamaṇḍalaḥ
evamāpyāyitaṃ somaṃ śuklapakṣe dinakramāt //

tato dvitīyāprabhṛti bahulasya caturdaśīm
pibantyambumayaṃ devā madhu saumyaṃ sudhāmṛtam //

saṃbhṛtaṃ tvardhamāsena hy amṛtaṃ sūryatejasā
pānārthamamṛtaṃ somaṃ paurṇamāsyāmupāsate //

ekarātriṃ surāḥ sarve pitṛbhistvṛṣibhiḥ saha
somasya kṛṣṇapakṣādau bhāskarābhimukhasya ca //

prakṣīyante parasyāntaḥ pīyamānāḥ kalāḥ kramāt
trayastriṃśacchatāścaiva trayastriṃśattathaiva ca //

trayastriṃśatsahasrāṇi devāḥ somaṃ pibanti vai
evaṃ dinakramātpīte vibudhaistu niśākare //

pītvārdhamāsaṃ gacchanti amāvāsyāṃ surottamāḥ
pitaraścopatiṣṭhanti amāvāsyāṃ niśākaram //

tataḥ pañcadaśe bhāge kiṃcicchiṣṭe kalātmake
aparāhṇe pitṛgaṇā jaghanyaṃ paryupāsate //

pibanti dvikalaṃ kālaṃ śiṣṭā tasya kalā tu yā
nisṛtaṃ tadamāvāsyāṃ gabhastibhyaḥ svadhāmṛtam //

māsatṛptimavāpyāgryāṃ pītvā gacchanti te 'mṛtam
pitṛbhiḥ pīyamānasya pañcadaśyāṃ kalā tu yā //

yāvattu kṣīyate tasya bhāgaḥ pañcadaśastu saḥ
amāvāsyāṃ tatastasyā antarā pūryate punaḥ //

vṛddhikṣayau vai pakṣādau ṣoḍaśyāṃ śaśinaḥ smṛtau
evaṃ sūryanimittaiṣā pakṣavṛddhirniśākare //