Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 64-65

Sanskrit:

देवरातसुत: सोऽपि छर्दित्वा यजुषां गणम् ।ततो गतोऽथ मुनयो दद‍ृशुस्तान् यजुर्गणान् ॥ ६४ ॥यजूंषि तित्तिरा भूत्वा तल्ल‍ोलुपतयाददु: ।तैत्तिरीया इति यजु:शाखा आसन् सुपेशला: ॥ ६५ ॥

ITRANS:

devarāta-sutaḥ so ’picharditvā yajuṣāṁ gaṇamtato gato ’tha munayodadṛśus tān yajur-gaṇān

Translation:

Yājñavalkya, the son of Devarāta, then vomited the mantras of the Yajur Veda and went away from there. The assembled disciples, looking greedily upon these yajur hymns, assumed the form of partridges and picked them all up. These divisions of the Yajur Veda therefore became known as the most beautiful Taittirīya-saṁhitā, the hymns collected by partridges [tittirāḥ].

Purport:

According to Śrīla Śrīdhara Svāmī, it is improper for a brāhmaṇa to collect what has been vomited, and so the powerful brāhmaṇa disciples of Vaiśampāyana assumed the form of tittiras, partridges, and collected the valuable mantras.