Tararahasya 3.18

3.18

gāyatrīṃ parijapyātha mūlamantraṃ japenna ca |
(p. 12) sā sandhyā niṣphalā jñeyāmyabhicārāya kalpyate ||
prātaḥsandhyāvihīnaśca na ca snānaphalaṃ labhet |
madhyāhnasandhyāhīnaśca na pūjāphalamāpnuyāt ||
sāyaṃ sandhyāvihīnasya japavighnaḥ sadā bhavet ||
tasmāt sundari! tattvajñaḥ sandhyātrayamupācaret ||
prātarna tarpaṇaṃ kāryaṃ na ca sāyaṃ viśeṣataḥ |
madhyāhne tarpaṇaṃ kṛtvā yathoktaphalavān bhavet ||
arghyahīnā tu yā sandhyā śokaduḥkhapradā matā |
arghyaṃ trisandhyaṃ dātavyamanyathā niṣphalo japaḥ ||
samantrāpi ca gāyatrī satyaṃ satyaṃ varānane! ||