The intention to fast, and the differences reported from Talhah bin Yahya in the narration of 'Aishah about it
أَخْبَرَنَا أَحْمَدُ بْنُ حَرْبٍ، قَالَ حَدَّثَنَا قَاسِمٌ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ طَلْحَةَ بْنِ يَحْيَى، عَنْ عَائِشَةَ بِنْتِ طَلْحَةَ، عَنْ عَائِشَةَ أُمِّ الْمُؤْمِنِينَ، قَالَتْ أَتَانَا رَسُولُ اللَّهِ صلى الله عليه وسلم يَوْمًا فَقُلْنَا أُهْدِيَ لَنَا حَيْسٌ قَدْ جَعَلْنَا لَكَ مِنْهُ نَصِيبًا . فَقَالَ " إِنِّي صَائِمٌ " . فَأَفْطَرَ .
It was narrated that 'Aishah said: "The Messenger of Allah (ﷺ) came to us one day and we said: 'We have been given some Hais and we set aside some for you.' He said: 'I am fasting, but he broke his fast.