Bhashya
मत्वा क्षामयन्— तथा नः अस्मान् प्रति, मा अपराधाःअपराधं मा कार्षीः, अस्मदीयोऽपराधः न ग्रहीतव्य इत्यर्थः ;तव च पितामहाः अस्मत्पितामहेषु यथा अपराधं न जगृहुः,तथा पितामहानां वृत्तम् अस्मास्वपि भवता रक्षणीयमित्य-र्थः ।यथा इयं विद्या त्वया प्रार्थिता इतः त्वत्संप्रदानात्पूर्वम्प्राक् न कस्मिन्नपि ब्राह्मणे उवास उषितवती, तथा त्वमपिजानीषे ; सर्वदा क्षत्रियपरम्परया इयं विद्या आगता ; सास्थितिः मयापि रक्षणीया, यदि शक्यते इति— उक्तम्‘दैवेषु गौतम तद्धरेषु मानुषाणां ब्रूहि’ इति ; न पुनः तवअदेयो वर इति ; इतः परं न शक्यते रक्षितुम् ; तामपिविद्याम् अहं तुभ्यं वक्ष्यामि ।को हि अन्योऽपि हि यस्मात्एवं ब्रुवन्तं त्वाम् अर्हति प्रत्याख्यातुम्— न वक्ष्यामीति ;अहं पुनः कथं न वक्ष्ये तुभ्यमिति ॥
In plain words
Taking this to heart, he tried to reassure him — 'don't hold this against us, don't count it as an offense' — meaning: nothing on our side should be held against you; and just as your forefathers never held an offense against ours, you should preserve that same understanding between us. Just as this knowledge you're asking for never lived in any brahmin before you were given it, you should know this too: it has always passed down only through kings. That old arrangement I'd like to preserve too, if I still can' — after all, it's already been said: 'Among the gods, Gautama, and those who hold it there, tell it to human beings' — so this boon can't really be refused you any longer; there's no way to keep guarding it past this point. So I will tell you this knowledge as well. Because really, who else could refuse someone speaking the way you just have, thinking 'I won't tell him'? How could I possibly not tell you?
Close to the Sanskrit
Having considered this, appeasing him — 'thus, towards us, let there be no offense; do not commit an offense' — the meaning is, an offense of ours should not be held against you; and just as your forefathers did not hold an offense against our forefathers, so the conduct of the forefathers should be preserved by you towards us as well — that is the meaning. Just as this knowledge, sought by you, before your being given it, never dwelt with any brahmin whatsoever, so you too should know; this knowledge has always come by the succession of kshatriyas; that established state should be preserved by me too, if it is possible' — thus it has been said elsewhere: 'Among the gods, O Gautama, and those there who hold it, speak it to human beings' — the boon is not, then, undeniable to you; beyond this point it cannot be withheld any further; that very knowledge I shall tell to you as well. For who else indeed, since you speak thus, could bring himself to refuse you — thinking 'I will not tell'? How then could I not tell you?