तस्मा आदित्याश्च विश्वे च देवास्तृतीयसवनं संप्रयच्छन्त्येष ह वै यज्ञस्यमात्रा वेद य एवं वेद य एवं वेद ॥ १७ ॥
In plain words
To him the Ādityas and the Viśve Devas grant the third pressing of the soma. Truly, he knows the measure of the sacrifice who knows thus—yes, he who knows thus.
Close to the Sanskrit
To him the Ādityas and the Viśve Devas grant the third pressing. This person indeed knows the measure of the sacrifice, who thus knows, who thus knows.