Taittiriyabrahmana 3.10.9.14

3.10.9.14

etád vái sāvitrásyāṣṭā́kṣaraṃ padám̐ śriyā́_abhíṣiktam /
yá eváṃ véda /
śriyā́ haivā́_abhíṣicyate //
tád etád ṛcā́_abhyuktam /
ṛcó akṣáre paramé vyòman /
yásmin devā́ ádhi víśve niṣedúḥ /
yás tán ná véda kím ṛcā́ kariṣyati /
yá ít tád vidús tá imé sámāsata íti //
ná ha vā́ etásya_ṛcā́ na yájuṣā ná sā́mnā_ártho 'sti /
yáḥ sāvitráṃ véda //

This is indeed the eight-syllabled quarter of the Sāvitra anointed with majesty.
He who knows thus
is anointed with majesty.
This has been declared by the ṛc:
"In the supreme space, the syllable of the ṛc, / in which all the gods have sat down; / he who does not know that, what will he do with the ṛc? / Those who know that sit here together."
Neither with ṛc, nor with yajus, nor with sāman does he have any need,
who knows the Sāvitra.