Bhashya
अथ ह पुनः यो यथोक्तान्पञ्चाग्नीन्वेद, स तैरप्याचरन्महापातकिभिः सह न पाप्मना लिप्यते, शुद्ध एव ।तेनपञ्चाग्निदर्शनेन पावितः यस्मात्पूतः, पुण्यो लोकः प्राजाप-त्यादिर्यस्य सोऽयं पुण्यलोकः भवति ; य एवं वेद यथोक्तंसमस्तं पञ्चभिः प्रश्नैः पृष्टमर्थजातं वेद ।द्विरुक्तिः समस्त-प्रश्ननिर्णयप्रदर्शनार्था ॥
In plain words
Now again, whoever knows the five fires as described is not touched by sin, even when moving among those who have committed heinous crimes—pure indeed is he. Purified by this vision of the five fires, he becomes the master of the meritorious world, such as the realm of Prajāpati. He who knows all this complete body of truth asked through the five questions—this repetition is meant to show that every single question has been fully resolved.
Close to the Sanskrit
Now again, whoever knows the five fires as stated, even associating with great sinners, is not stained by sin, pure indeed. Because he is cleansed by that five-fire vision, this one becomes possessing of the meritorious world, such as Prajāpati's world; who thus knows the entire subject matter asked through the five questions. The repetition is for the purpose of demonstrating the settlement of all questions.