Sunan Ibn Majah 1976
It was narrated that 'Aishah said:
"Usamah stumbled at the threshold of the door and cut his face. The Messenger of Allah said: 'Remove the harm (the blood) from him,' but I was repulsed by that. He started to suck the blood and remove it from his face, then he said: 'If Usamah were a girl, I would have adorned him and dressed him until I married him off."'
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا شَرِيكٌ، عَنِ الْعَبَّاسِ بْنِ ذَرِيحٍ، عَنِ الْبَهِيِّ، عَنْ عَائِشَةَ، قَالَتْ عَثَرَ أُسَامَةُ بِعَتَبَةِ الْبَابِ فَشُجَّ فِي وَجْهِهِ فَقَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ ‏"‏ أَمِيطِي عَنْهُ الأَذَى ‏"‏ ‏.‏ فَتَقَذَّرْتُهُ فَجَعَلَ يَمَصُّ عَنْهُ الدَّمَ وَيَمُجُّهُ عَنْ وَجْهِهِ ثُمَّ قَالَ ‏"‏ لَوْ كَانَ أُسَامَةُ جَارِيَةً لَحَلَّيْتُهُ وَكَسَوْتُهُ حَتَّى أُنَفِّقَهُ ‏"‏ ‏.‏