Mishkat al-Masabih 2786
'A’isha said:
Abu Bakr had a slave who brought him his earnings	 and Abu Bakr would eat* some of his earnings. One day he brought him something and when Abu Bakr had eaten some of it the slave asked him whether he knew what it was. Abu Bakr asked what it was, and he replied, "I acted as a soothsayer for a man in the pre-Islamic period, and not being good at it, I deceived him; but he met me and gave me that, so this is the thing of which you have eaten.” She said that Abu Bakr then put his hand in his mouth and vomited everything which was in his stomach. 

Bukhari transmitted it.

* Here the word is used in its literal sense. Elsewhere the word is often translated by "enjoy when it is not clear that something is actually eaten.”
وَعَنْ عَائِشَةَ قَالَتْ: كَانَ لِأَبِي بَكْرٍ رَضِيَ اللَّهُ عَنْهُ غُلَامٌ يُخْرِّجُ لَهُ الْخَرَاجَ فَكَانَ أَبُو بَكْرٍ يَأْكُلُ مِنْ خَرَاجِهِ فَجَاءَ يَوْمًا بشيءٍ فأكلَ مِنْهُ أَبُو بَكْرٍ فَقَالَ لَهُ الْغُلَامُ: تَدْرِي مَا هَذَا؟ فَقَالَ أَبُو بَكْرٍ: وَمَا هُوَ؟ قَالَ: كُنْتُ تَكَهَّنْتُ لِإِنْسَانٍ فِي الْجَاهِلِيَّةِ وَمَا أُحسِنُ الكهَانةَ إِلاَّ أَنِّي خدَعتُه فلَقيَني فَأَعْطَانِي بِذَلِكَ فَهَذَا الَّذِي أَكَلْتَ مِنْهُ قَالَتْ: فَأَدْخَلَ أَبُو بَكْرٍ يَدَهُ فَقَاءَ كُلَّ شَيْءٍ فِي بَطْنه. رَوَاهُ البُخَارِيّ