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यद्ब्राह्मणः पश्यति यच्च विद्वान् कथंरूपं तदमृतमक्षरं परम् ॥ १९ ॥
In plain words
What the brāhmaṇa sees — what the one who truly knows sees — that deathless, unwasting, highest thing: what is it like?
Close to the Sanskrit
That which the brāhmaṇa sees, and which the knower [sees] — of what form is that deathless, imperishable, supreme [reality]?