Sahih al-Bukhari 3918
Al-Bara added:
I then went with Abu Bakr into his 
home (carrying that saddle) and there I saw his daughter `Aisha Lying in a bed because of heavy fever 
and I saw her father Abu Bakr kissing her cheek and saying, "How are you, little daughter?"
قَالَ الْبَرَاءُ فَدَخَلْتُ مَعَ أَبِي بَكْرٍ عَلَى أَهْلِهِ، فَإِذَا عَائِشَةُ ابْنَتُهُ مُضْطَجِعَةٌ، قَدْ أَصَابَتْهَا حُمَّى، فَرَأَيْتُ أَبَاهَا فَقَبَّلَ خَدَّهَا، وَقَالَ كَيْفَ أَنْتِ يَا بُنَيَّةُ