I heard the Messenger of Allah ﷺ say: ʿDeeds are but by intentions and each man will have but that which he intended. If a man's migration was for the sake of Allah, then his migration was for that for which he migrated, but if his migration was to achieve some worldly aim or to take some woman in marriage, his migration was for that for which he migrated.ʿ (Using translation from Aḥmad 168)   

قَالَ رَسُولُ اللهِ ﷺ الْأَعْمَالُ بِالنِّيَّةِ وَإِنَّمَا لِامْرِئٍ مَا نَوَى فَمَنْ كَانَتْ هِجْرَتُهُ إِلَى اللهِ ﷻ وَإِلَى رَسُولِهِ فَهِجْرَتُهُ إِلَى اللهِ وَرَسُولِهِ وَمَنْ كَانَتْ هِجْرَتُهُ إِلَى دُنْيَا يُصِيبُهَا أَوِ امْرَأَةٍ يَتَزَوَّجُهَا فَهِجْرَتُهُ إِلَى مَا هَاجَرَ إِلَيْهِ  

The Prophet ﷺ said, "Allah said: The Fast is for Me and I will give the reward for it, as he (the one who observes the fast) leaves his sexual desire, food and drink for My Sake. Fasting is a screen (from Hell) and there are two pleasures for a fasting person, one at the time of breaking his fast, and the other at the time when he will meet his Lord. And the smell of the mouth of a fasting person is better in Allah's Sight than the smell of musk." (See Hadith No. 128, Vol. 3). (Using translation from Bukhārī 7492)   

قَالَ رَسُولُ اللهِ ﷺ يَقُولُ اللهُ ﷻ الصَّوْمُ لِي وَأَنَا أَجْزِي بِهِ يَدَعُ شَهْوَتَهُ وَأَكْلَهُ وَشُرْبَهُ مِنْ أَجْلِي وَالصَّوْمُ جُنَّةٌ وَلِلصَّائِمِ فَرْحَتَانِ فَرْحَةٌ عِنْدَ إِفْطَارِهِ وَفَرْحَةٌ عِنْدَ لِقَاءِ رَبِّهِ وَلَخُلُوفُ فِيهِ أَطْيَبُ عِنْدَ اللهِ مِنْ رِيحِ الْمِسْكِ  

[Machine] That fainting during fasting does not invalidate it.  

أَنَّ الْإِغْمَاءَ خِلَالَ الصَّوْمِ لَا يُفْسِدُهُ