अथ यत्सं प्रतिमध्यन्दिने स उद्गीथस्त-दस्य देवा अन्वायत्तास्तस्मात्ते सत्तमाःप्राजापत्यानामुद्गीथभाजिनो ह्येतस्य साम्नः ॥ ५ ॥
In plain words
Now, that which occurs precisely at midday is the udgītha. To it the gods are connected. Therefore they are the most supreme among the descendants of Prajāpati, because they partake in the udgītha of this sāman.
Close to the Sanskrit
Now that which is precisely at midday, that is the udgītha. To that the gods are dependent. Therefore they are the most excellent among the offspring of Prajāpati, because they are sharers in the udgītha of this sāman.