Mark does not give this as their answer, but relates that the Lord after His question put to them, made this answer to Himself. But it may be easily explained, that their words are subjoined in such a way as to shew that they spoke them, without putting in ‘And they answered.’ Or this answer is attributed to the Lord, because, what they said being true, might well be said to have been spoken by Him who is truth.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: de Cons. Ev., ii, 70