On hearing that someone had reviled him, he said, “As long as I’m not in his presence, let him flog me as well.”

[ἀκούσας ὑπό τινος λοιδορεῖσθαι, “ἀπόντα με,” ἔφη, “καὶ μαστιγούτω.”]

Aristotle (384-322 BC) Greek philosopher
Attributed in Diogenes Laërtius, Lives and Opinions of Eminent Philosophers [Vitae Philosophorum], Book 5, sec. 11 [tr. Mensch (2018)]
    (Source)

(Source (Greek)). Alternate translations:

Having heard that he was abused by some one, he said, “He may beat me too, if he likes, in my absence.”
[tr. Yonge (1853), sec. 11]

On hearing that someone abused him, he rejoined, "He may even scourge me so it be in my absence."
[tr. Hicks (1925), sec. 18]

After he heard that he was mocked by someone, he said, “Let him insult me when I am absent.”
[tr. @sentantiq (2016)]