Hadithcore
Sahih al-Bukhari, 5218
sahih

Narrated Ibn `Abbas:

that `Umar entered upon Hafsa and said, "O my daughter! Do not be misled by the manners of her who is proud of her beauty because of the love of Allah's Messenger (ﷺ) for her." By 'her' he meant `Aisha. `Umar added, "Then I told that to Allah's Messenger (ﷺ) and he smiled (on hearing that).

حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُلَيْمَانُ، عَنْ يَحْيَى، عَنْ عُبَيْدِ بْنِ حُنَيْنٍ، سَمِعَ ابْنَ عَبَّاسٍ، عَنْ عُمَرَ ـ رضى الله عنهم ـ دَخَلَ عَلَى حَفْصَةَ فَقَالَ يَا بُنَيَّةِ لاَ يَغُرَّنَّكِ هَذِهِ الَّتِي أَعْجَبَهَا حُسْنُهَا حُبُّ رَسُولِ اللَّهِ صلى الله عليه وسلم إِيَّاهَا ـ يُرِيدُ عَائِشَةَ ـ فَقَصَصْتُ عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَتَبَسَّمَ‏.‏

References2 variants
In-Book Reference
Book 67, Hadith 151
USC-MSA web (English) reference
Vol. 7, Book 62, Hadith 145 (deprecated numbering scheme)