In plain words
All the sages declare this of You, as do the divine sage Narada, Asita, Devala, and Vyasa; and You Yourself tell me so.
Word for word
All the seers call You [so], the divine seer Nārada likewise, Asita, Devala, Vyāsa; and You Yourself indeed tell me.
The commentators
Bhagavadgītābhāṣyam
ईदृशम् —
आहुः कथयन्ति त्वाम् ऋषयः वसिष्ठादयः सर्वे देवर्षिः नारदः तथा । असितः देवलोऽपि एवमेवाह, व्यासश्च, स्वयं चैव त्वं च ब्रवीषि मे ॥ १३ ॥
In plain words
Something like this —
The sages say this about you — Vasiṣṭha and all the rest, and the divine sage Nārada too. Asita and Devala say exactly the same, and so does Vyāsa. And you yourself have told me this as well.
Close to the Sanskrit
Of this kind —
They say, they declare, of you, the sages — Vasiṣṭha and others — all, and the divine sage Nārada likewise. Asita, Devala too, says just so, and Vyāsa; and you yourself also say this to me.