वैदिकतान्त्रिकोभयसन्ध्याकरणे युक्तिःWhy both the Vedic and the Tantric sandhyā are done
Verse 88
द्विजादीनां प्रभेदार्थं शूद्रेभ्यः परमेश्वरि । सन्ध्येयं वैदिकी प्रोक्ता प्रागेवाह्निककर्म्मणाम् ॥ ८८ ॥
dvijādīnāṁ prabhēdārthaṁ śūdrēbhyaḥ paramēśvari | sandhyēyaṁ vaidikī prōktā prāgēvāhnikakarmmaṇām || 88 ||
Translation
To distinguish the twice-born and the rest from the śūdras, Parameśvarī, this Vedic sandhyā is told, before the daily rites.
Word by word
- dvija
- of the twice-born
- ādīnāṁ
- and the rest
- prabhēda
- to distinguish
- arthaṁ
- for the purpose
- śūdrēbhyaḥ
- from the śūdras
- paramēśvari
- O Parameśvarī
- sandhyā
- (sandhyā) sandhyā
- iyaṁ
- this
- vaidikī
- Vedic
- prōktā
- is told
- prāg
- (prāk) before
- ēva
- indeed
- āhnika
- the daily
- karmmaṇām
- rites
Meaning
The reason for keeping the Vedic sandhyā: it marks the twice-born apart from the śūdras, and it is done "before" the Tantric daily rites, as the commentary says. Its purpose is social distinction, not salvation; the next verse says so plainly. The commentary reads verses 88 and 89 together.

Commentary
Hariharānanda Bhāratī’s Sanskrit commentary, translated
"Dvijādīnām…". O Parameśvarī, to distinguish the twice-born, the brāhmaṇa and the rest, from the śūdras, this Vedic sandhyā is said to be done before the daily Tantric rites. (This explanation covers verses 88 and 89.)