Atharvaveda 15.13.4

15.13.4

[13.7]a) tád yásyaiváṃ vidvā́n vrā́tyaś caturthī́ṃ rā́trim átithir gr̥hé vásati | [7]
[13.8]b) yé púṇyānāṃ púṇyā lokā́s tā́n evá ténā́va rundhe ||4|| [8]

⌊7.⌋ Now in whosesoever house a thus-knowing Vrātya abides a fourth night as guest, ⌊8.⌋ he thereby gains possession of those worlds that are pure of the pure.