"The Prophet left me while he had a joyous look of contentment and he returned to me grieving. So I asked him about that and he said: 'I entered the Ka'bah, and I wished that I had not done it. I fear that my Ummah will follow me (in that) after me.'"  

خَرَجَ النَّبِيُّ ﷺ مِنْ عِنْدِي وَهُوَ قَرِيرُ الْعَيْنِ طَيِّبُ النَّفْسِ فَرَجَعَ إِلَىَّ وَهُوَ حَزِينٌ فَقُلْتُ لَهُ فَقَالَ إِنِّي دَخَلْتُ الْكَعْبَةَ وَوَدِدْتُ أَنِّي لَمْ أَكُنْ فَعَلْتُ إِنِّي أَخَافُ أَنْ أَكُونَ أَتْعَبْتُ أُمَّتِي مِنْ بَعْدِي