The Prophet ﷺ commanded him to fast three days, or feed six poor people, or slaughter a sheep.
حدثنا مؤمل بن إسماعيل حدثنا سفيان عن عبد الرحمن بن الأصبهاني عن عبد الله بن معقل بن مقرن
أن النبي ﷺ أمره أن يصوم ثلاثة أيام أو يطعم ستة مساكين أو يذبح شاة
Its isnad is sahih, despite some discussion regarding the memory of Muammal bin Ismail, but he is corroborated, for the hadith has already been given through multiple routes. See what has preceded among the hadiths of Kaab.