Garudapurana 2.34.66

2.34.66

māsatraye trirātraṃ syāt ṣaṇmāsena tu pakṣiṇī /
ahaḥ saṃvatsarādarbvāk pūrṇe dattvodakaṃ śuciḥ /
anenaivā nusāreṇa śuddhiḥ syāt sārvavarṇikī //

[If hearing of it] within three months, there is three nights [of impurity]; within six months, a pakṣiṇī; / before a year, a single day; when [the year] is completed, one is pure upon offering water; / by this very progression, purification applies to all castes.