Zen master Hakuin was praised as someone who lived a clean life.
A pretty Japanese girl, whose parents owned a grocery store, lived next door to him. Suddenly, without even being prepared for it, the parents discovered that the girl was pregnant. They were very angry, and that’s why the girl didn’t dare tell me who the father was. But when her parents put pressure on her, she, in despair, finally mentioned the name of Hakuin. Furious, the parents immediately went to the master to question him. And all Hakuin said was, " Oh, really?’
After the baby was born, the parents took it to Hakuin. He had lost his good reputation, but that didn’t bother him, and he took very good care of the boy. Milk and everything else he needed for the little boy, Hakuin bought from his neighbors. A year later the young mother could no longer bear it, and finally she told her parents the truth: the real father was not a Hakuin, but a boy who worked at the fish market. Immediately the parents went to Hakuin and asked for his forgiveness. They wore themselves out in apologies and asked the baby back. When he gave them the baby, all he said was, " Oh, really?’
(Translated from a Dutch article : https://boeddhistischdagblad.nl/boeddhisme/zen-zen-zen/150295-sogenji-desu-satori-2/)