This verse is not present in the Yajurveda.
This verse is a present in a commentary to a verse in the so-called “Brhihad Brahma Nitya Karma Sammuchya” (see page 51 of this book here). This book and many others (for example this one) is (was) a north/central Indian equivalent to the current versions of Sandhyavandan type of post-Vedic practices that are ...
There are two forms of Yajurveda: Krishna (Black) and the Shukla (White).
The Krishna Yajurveda consists of prose mixed with the mantras, therefore the word Krishna.
Among different recension of the Krishna Yajurveda, Taittrīya is the most popular one, however, Maitrāyaṇīya recension is also studied well by the scholars.
The Taittrīya Samhita has no ...
Yes, there are a few instances in both Taittirīya Saṃhitā and Brāhmaṇa (attached to Kṛṣṇa Yajurveda) and the Śatapatha Brāhmaṇa (Śukla Yajurveda) where it's said śūdras are not fit to conduct yajñas and that brāhmaṇas and kṣatriyas are superior to other varṇas (vaiśyas and śūdras).
Taittirīya Saṃhitā (Kṛṣṇa Yajurveda) on śūdras:
Krishna Yajurveda - 2:2:10
“asavadityo na vy arocata tasmai devah prayascittim aichan tasma etam
| somaraudram carum nir avapan tenaivasmin rucam adadhus |”
“Yonder sun did not shine, the gods sought an atonement for him, for
him they offered this oblation to Soma and Rudra: verily thereby they
bestowed brightness upon him. If he desires to ...