kIlakastotram 7

सोऽपि क्षॆममवाप्नोति सर्वमॆव न संशयः | 
कृष्णायां वा चतुर्दश्यामष्टम्यां वा समाहितः || 7 ||

so.api kShEmamavApnoti sarvamEva na saMshayaH |

kRRiShNAyAM vA chaturdashyAmaShTamyAM vA samAhitaH || 7 ||

Without doubt, he (who recites it) properly on either the fourteenth or the eighth 

day of the dark half of the lunar cycle obtains all well-being.