Humaid said: Al-Hasan came to us. The jurists of Mecca told me that I should speak to him that some day he should hold a meeting for them and preach to them. He said: Yes. So they gathered and he addressed them. I did not see anyone on orator greater than him. A man said: Abu Sa’id, who created Satan? He replied: Glory be to Allah! Is there any creator other than Allah? Allah created Satan, and he created good and created evil. The man said: May Allah ruin them! How do they lie to this old man.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، قَالَ حَدَّثَنَا حَمَّادٌ، حَدَّثَنَا حُمَيْدٌ، قَالَ قَدِمَ عَلَيْنَا الْحَسَنُ مَكَّةَ فَكَلَّمَنِي فُقَهَاءُ أَهْلِ مَكَّةَ أَنْ أُكَلِّمَهُ فِي أَنْ يَجْلِسَ لَهُمْ يَوْمًا يَعِظُهُمْ فِيهِ . فَقَالَ نَعَمْ . فَاجْتَمَعُوا فَخَطَبَهُمْ فَمَا رَأَيْتُ أَخْطَبَ مِنْهُ فَقَالَ رَجُلٌ يَا أَبَا سَعِيدٍ مَنْ خَلَقَ الشَّيْطَانَ فَقَالَ سُبْحَانَ اللَّهِ هَلْ مِنْ خَالِقٍ غَيْرُ اللَّهِ خَلَقَ اللَّهُ الشَّيْطَانَ وَخَلَقَ الْخَيْرَ وَخَلَقَ الشَّرَّ . قَالَ الرَّجُلُ قَاتَلَهُمُ اللَّهُ كَيْفَ يَكْذِبُونَ عَلَى هَذَا الشَّيْخِ .
sunnah.com